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  <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_InternationalMarketsGroupMember" abstract="true" name="InternationalMarketsGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_LineofCreditFacilityAvailableIncreaseCapacityAmount" abstract="false" name="LineofCreditFacilityAvailableIncreaseCapacityAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="blkb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="blkb_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsAndLiabilitiesWorkingCapitalExcludingDeferredRevenue" abstract="false" name="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsAndLiabilitiesWorkingCapitalExcludingDeferredRevenue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="blkb_ChangeInAccountingEstimateWorkforceStrategyMember" abstract="true" name="ChangeInAccountingEstimateWorkforceStrategyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="blkb_TaxesPrepaidAndReceivableCurrentAndLongTerm" abstract="false" name="TaxesPrepaidAndReceivableCurrentAndLongTerm" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="blkb_PrepaidSoftwareMaintenanceAndSubscriptionsCurrent" abstract="false" name="PrepaidSoftwareMaintenanceAndSubscriptionsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <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_ScheduleOfPrepaidExpensesAndOtherAssetsCurrentTableTextBlock" abstract="false" name="ScheduleOfPrepaidExpensesAndOtherAssetsCurrentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
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  <xs:element id="blkb_SurrenderOfSharesUponRestrictedStockAndRestrictedUnitVestingAndExerciseofStockAppreciationRights" abstract="false" name="SurrenderOfSharesUponRestrictedStockAndRestrictedUnitVestingAndExerciseofStockAppreciationRights" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="blkb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilitiesNoncurrent" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilitiesNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <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_ExerciseOfStockOptionsAndStockAppreciationRightsValue" abstract="false" name="ExerciseOfStockOptionsAndStockAppreciationRightsValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <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_SecurityIncidentNumberOfConsumerClassActionCases" abstract="false" name="SecurityIncidentNumberOfConsumerClassActionCases" 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_SwinglineloansMember" abstract="true" name="SwinglineloansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_ScheduleOfSupplementalCashFlowInformationRelatedToLeasesTableTextBlock" abstract="false" name="ScheduleOfSupplementalCashFlowInformationRelatedToLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
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  <xs:element id="blkb_USMarketsGroupMember" abstract="true" name="USMarketsGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="blkb_ScheduleOfSupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" abstract="false" name="ScheduleOfSupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
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  <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_OperatingLeaseLiabilitiesNetOfCurrentPortionMember" abstract="true" name="OperatingLeaseLiabilitiesNetOfCurrentPortionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_SecurityIncidentExpense" abstract="false" name="SecurityIncidentExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="blkb_CostOfOneTimeServicesAndOtherMember" abstract="true" name="CostOfOneTimeServicesAndOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="blkb_COVID19Member" abstract="true" name="COVID19Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="blkb_DueToCustomersCurrent" abstract="false" name="DueToCustomersCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="blkb_SecurityIncidentNumberOfCustomerReimbursementRequestsSettled" abstract="false" name="SecurityIncidentNumberOfCustomerReimbursementRequestsSettled" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
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  <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_MaximumThroughDecember312023Member" abstract="true" name="MaximumThroughDecember312023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <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_AccruedExpensesAndOtherCurrentLiabilities" abstract="false" name="AccruedExpensesAndOtherCurrentLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_NetLeverageRatioRequirementAxis" abstract="true" name="NetLeverageRatioRequirementAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <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_AmortizationOfIntangibleAssetsAcquiredByIncomeStatementLocationTable" abstract="true" name="AmortizationOfIntangibleAssetsAcquiredByIncomeStatementLocationTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <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_GlobalHQMember" abstract="true" name="GlobalHQMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_SecurityIncidentPenaltyPaid" abstract="false" name="SecurityIncidentPenaltyPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="blkb_IncreaseDecreaseInDueToCustomers" abstract="false" name="IncreaseDecreaseInDueToCustomers" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
