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  <xs:element id="blkb_SocialSectorMember" abstract="true" name="SocialSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_SignificantAccountingPoliciesLineItems" abstract="true" name="SignificantAccountingPoliciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="blkb_LiabilityInsuranceAmountDeductible" abstract="false" name="LiabilityInsuranceAmountDeductible" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_LossContingencyClaimsSettledPercent" abstract="false" name="LossContingencyClaimsSettledPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="blkb_EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxIncomePercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxIncomePercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="blkb_ValuationAllowanceChangeChargesToExpenseMember" abstract="true" name="ValuationAllowanceChangeChargesToExpenseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_MaximumThroughDecember312023Member" abstract="true" name="MaximumThroughDecember312023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_EffectiveIncomeTaxRateReconciliationAcquisitionCosts" abstract="false" name="EffectiveIncomeTaxRateReconciliationAcquisitionCosts" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="blkb_NonoperatingIncomeExpenseExcludingInterestExpense" abstract="false" name="NonoperatingIncomeExpenseExcludingInterestExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_EffectiveIncomeTaxRateReconciliationDTAAdjustments" abstract="false" name="EffectiveIncomeTaxRateReconciliationDTAAdjustments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="blkb_KilterMember" abstract="true" name="KilterMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_AccruedCommissionsAndSalariesCurrentAndLongTerm" abstract="false" name="AccruedCommissionsAndSalariesCurrentAndLongTerm" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefits" abstract="false" name="EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefits" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="blkb_PutativeConsumerClassActionCasesMember" abstract="true" name="PutativeConsumerClassActionCasesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_AccumulatedOtherComprehensiveIncomeRollForward" abstract="true" name="AccumulatedOtherComprehensiveIncomeRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="blkb_ExerciseOfStockOptionsAndStockAppreciationRightsValue" abstract="false" name="ExerciseOfStockOptionsAndStockAppreciationRightsValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_CreditSensitiveAdjustment" abstract="false" name="CreditSensitiveAdjustment" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="blkb_NetLeverageRatio" abstract="false" name="NetLeverageRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="blkb_AmortizationOfIntangibleAssetsAcquiredByIncomeStatementLocationTable" abstract="true" name="AmortizationOfIntangibleAssetsAcquiredByIncomeStatementLocationTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="blkb_EstimatedAmortizationExpenseforFiniteLivedIntangibleAssetsfortheNextFiveYears" abstract="false" name="EstimatedAmortizationExpenseforFiniteLivedIntangibleAssetsfortheNextFiveYears" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SecurityIncidentExpense" abstract="false" name="SecurityIncidentExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_ContractTermOfRecurringRevenueContractsAtRenewalYears" abstract="false" name="ContractTermOfRecurringRevenueContractsAtRenewalYears" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="blkb_SecurityIncidentNumberOfCustomerReimbursementRequestsReceived" abstract="false" name="SecurityIncidentNumberOfCustomerReimbursementRequestsReceived" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="blkb_ChangeInCustomerFundsReceivable" abstract="false" name="ChangeInCustomerFundsReceivable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_AccruedTransactionBasedCostsRelatedToPaymentsServices" abstract="false" name="AccruedTransactionBasedCostsRelatedToPaymentsServices" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_AdjustmentsToAdditionalPaidInCapitalStockIssuedRetirements" abstract="false" name="AdjustmentsToAdditionalPaidInCapitalStockIssuedRetirements" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_AccruedExpensesAndOtherCurrentLiabilities" abstract="false" name="AccruedExpensesAndOtherCurrentLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_DeferredTaxAssetsLeasingArrangements" abstract="false" name="DeferredTaxAssetsLeasingArrangements" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_IncreaseDecreaseAccruedExpensesAndOtherLiabilities" abstract="false" name="IncreaseDecreaseAccruedExpensesAndOtherLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SecurityIncidentExpectedCost" abstract="false" name="SecurityIncidentExpectedCost" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_IncrementalTermLoanMember" abstract="true" name="IncrementalTermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_SwinglineloansMember" abstract="true" name="SwinglineloansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_DeferredTaxAssetsTaxCreditCarryforwardsStateAndForeign" abstract="false" name="DeferredTaxAssetsTaxCreditCarryforwardsStateAndForeign" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_OperatingLeaseLiabilitiesNetOfCurrentPortionMember" abstract="true" name="OperatingLeaseLiabilitiesNetOfCurrentPortionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_SecurityIncidentCumulativeExpense" abstract="false" name="SecurityIncidentCumulativeExpense" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_ContractTermOfRecurringRevenueContractsAtContractInceptionYears" abstract="false" name="ContractTermOfRecurringRevenueContractsAtContractInceptionYears" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="blkb_RestrictedStockUnitTimeBasedMember" abstract="true" name="RestrictedStockUnitTimeBasedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_PrepaidSoftwareMaintenanceCurrentAndLongTerm" abstract="false" name="PrepaidSoftwareMaintenanceCurrentAndLongTerm" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="blkb_EVERFIMember" abstract="true" name="EVERFIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_SoftwareAndContentDevelopmentMember" abstract="true" name="SoftwareAndContentDevelopmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_DeferredTaxLiabilitiesDeferredExpenseSalesCommissions" abstract="false" name="DeferredTaxLiabilitiesDeferredExpenseSalesCommissions" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SecurityIncidentCumulativeNetExpense" abstract="false" name="SecurityIncidentCumulativeNetExpense" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_COVID19Member" abstract="true" name="COVID19Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_SecurityIncidentPenaltyPaid" abstract="false" name="SecurityIncidentPenaltyPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_CapitalizedContentGross" abstract="false" name="CapitalizedContentGross" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SecurityIncidentNetPreTaxExpense" abstract="false" name="SecurityIncidentNetPreTaxExpense" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_LongtermPurchaseCommitmentRemainingMinimumAmountCommitted" abstract="false" name="LongtermPurchaseCommitmentRemainingMinimumAmountCommitted" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_DeferredIncomeTaxesAndOtherAssetsCurrentAndNoncurrent" abstract="false" name="DeferredIncomeTaxesAndOtherAssetsCurrentAndNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_ScheduleofAcquiredIntangibleAssetsbyMajorClassLineItems" abstract="true" name="ScheduleofAcquiredIntangibleAssetsbyMajorClassLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="blkb_AmortizationOfIntangibleAssetsAcquiredByIncomeStatementLocationLineItems" abstract="true" name="AmortizationOfIntangibleAssetsAcquiredByIncomeStatementLocationLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="blkb_PrepaidSoftwareMaintenanceAndSubscriptionsCurrent" abstract="false" name="PrepaidSoftwareMaintenanceAndSubscriptionsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SignificantAccountingPoliciesTable" abstract="true" name="SignificantAccountingPoliciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="blkb_ScheduleOfSupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" abstract="false" name="ScheduleOfSupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="blkb_ScheduleOfPrepaidExpensesAndOtherAssetsCurrentTableTextBlock" abstract="false" name="ScheduleOfPrepaidExpensesAndOtherAssetsCurrentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="blkb_OneMonthMember" abstract="true" name="OneMonthMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_ComputerSoftwareMember" abstract="true" name="ComputerSoftwareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_SecurityIncidentAccruedInsuranceRecoveries" abstract="false" name="SecurityIncidentAccruedInsuranceRecoveries" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_IncomeTaxesLineItems" abstract="true" name="IncomeTaxesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="blkb_RestrictedCashLettersOfCreditForOperatingLeases" abstract="false" name="RestrictedCashLettersOfCreditForOperatingLeases" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_EffectiveIncomeTaxRateReconciliationTaxCreditsStateAndLocal" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxCreditsStateAndLocal" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="blkb_ScheduleofAcquiredIntangibleAssetsbyMajorClassTable" abstract="true" name="ScheduleofAcquiredIntangibleAssetsbyMajorClassTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="blkb_SalesTaxesPolicyTextBlock" abstract="false" name="SalesTaxesPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="blkb_ScheduleOfSupplementalCashFlowInformationRelatedToLeasesTableTextBlock" abstract="false" name="ScheduleOfSupplementalCashFlowInformationRelatedToLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="blkb_SecurityIncidentNetCashOutlays" abstract="false" name="SecurityIncidentNetCashOutlays" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SecurityIncidentNetExpense" abstract="false" name="SecurityIncidentNetExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_OperatingLossCarryforwardsSubjectToExpiration" abstract="false" name="OperatingLossCarryforwardsSubjectToExpiration" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_RetirementsOfCommonStockShares" abstract="false" name="RetirementsOfCommonStockShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="blkb_SeniorSecuredNoteSeriesA2Member" abstract="true" name="SeniorSecuredNoteSeriesA2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_DisaggregationOfRevenueRecurringTableTextBlock" abstract="false" name="DisaggregationOfRevenueRecurringTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="blkb_ExerciseOfStockOptionsAndStockAppreciationRightsShares" abstract="false" name="ExerciseOfStockOptionsAndStockAppreciationRightsShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="blkb_ScheduleOfDebtInstrumentsOtherTableTextBlock" abstract="false" name="ScheduleOfDebtInstrumentsOtherTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="blkb_LineofCreditFacilityAvailableIncreaseCapacityAmount" abstract="false" name="LineofCreditFacilityAvailableIncreaseCapacityAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_AccruedCustomerCreditBalancesCurrentAndLongTerm" abstract="false" name="AccruedCustomerCreditBalancesCurrentAndLongTerm" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_ExpectedNetCashOutlaysForOngoingLegalFees" abstract="false" name="ExpectedNetCashOutlaysForOngoingLegalFees" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SecurityIncidentNumberOfReservationsOfTheRightToSeekFutureExpenseRecovery" abstract="false" name="SecurityIncidentNumberOfReservationsOfTheRightToSeekFutureExpenseRecovery" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="blkb_DeferredTaxAssetIntangibleAssets" abstract="false" name="DeferredTaxAssetIntangibleAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_AccruedExpensesAndOtherLiabilitiesTextBlock" abstract="false" name="AccruedExpensesAndOtherLiabilitiesTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="blkb_PutativeConsumerClassActionCasesCanadianCourtsMember" abstract="true" name="PutativeConsumerClassActionCasesCanadianCourtsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_TransactionalRecurringMember" abstract="true" name="TransactionalRecurringMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_DeferredTaxAssetsTaxDeferredExpenseCapitalizedRDAndSoftwareCosts" abstract="false" name="DeferredTaxAssetsTaxDeferredExpenseCapitalizedRDAndSoftwareCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_SeniorSecuredNoteSeriesA1Member" abstract="true" name="SeniorSecuredNoteSeriesA1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_RecurringMember" abstract="true" name="RecurringMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_NetLeverageRatioRequirementDomain" abstract="true" name="NetLeverageRatioRequirementDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_LiabilityInsuranceAmountTotal" abstract="false" name="LiabilityInsuranceAmountTotal" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_PutativeConsumerClassActionCasesUSFederalCourtsMember" abstract="true" name="PutativeConsumerClassActionCasesUSFederalCourtsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_DerivativeInstrumentsCurrentAndLongTerm" abstract="false" name="DerivativeInstrumentsCurrentAndLongTerm" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_DueToCustomersCurrent" abstract="false" name="DueToCustomersCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_PreferredStockPurchaseRightsMember" abstract="true" name="PreferredStockPurchaseRightsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_CorporateSectorMember" abstract="true" name="CorporateSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_SecurityIncidentNumberOfStateAttorneysGeneral" abstract="false" name="SecurityIncidentNumberOfStateAttorneysGeneral" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="blkb_MaximumAfterDecember312023Member" abstract="true" name="MaximumAfterDecember312023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_LineOfCreditFacilityVariableInterestRate" abstract="false" name="LineOfCreditFacilityVariableInterestRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="blkb_ThirdpartyTechnologyMember" abstract="true" name="ThirdpartyTechnologyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_ApplicableInterestPeriodDomain" abstract="true" name="ApplicableInterestPeriodDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_PercentageOfSalaryContributionByEmployees" abstract="false" name="PercentageOfSalaryContributionByEmployees" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="blkb_ValuationAllowanceChangeAcquisitionRelatedMember" abstract="true" name="ValuationAllowanceChangeAcquisitionRelatedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_AccruedexpensesandothercurrentliabilitiesMember" abstract="true" name="AccruedexpensesandothercurrentliabilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_PrepaidInsuranceCurrentandLongterm" abstract="false" name="PrepaidInsuranceCurrentandLongterm" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_AllowanceforReturnsMember" abstract="true" name="AllowanceforReturnsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_IncomeTaxesTable" abstract="true" name="IncomeTaxesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="blkb_EffectiveIncomeTaxRateReconciliationDeductionTCJAFDIIPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationDeductionTCJAFDIIPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
</xs:schema>
