If you sql server is running 64 bit and your ssis is using something other than a 64 bit provider you might receive an error with your job.
SSIS Error Code DTS_E_OLEDB_NOPROVIDER_64BIT_ERROR. The requested OLE DB provider Microsoft.Jet.OLEDB.4.0 is not registered — perhaps no 64-bit provider is available Error code: 0×00000000. An OLE DB record is available. Source: "Microsoft OLE DB Service Components" Hresult: 0×80040154 Description: "Class not registered". End Error Error: 2012-01-18 11:58:16.53 Code: 0xC020801C Description: SSIS Error Code DTS_E_CANNOTACQUIRECONNECTIONFROMCONNECTIONMANAGER.
Change the step on your job (the one executing your ssis package) to Use 32 bit runtime (Execution options tab). Jet is not 64 bit, therefore you have to change your step to run it as a 32 bit application.
