Riva reported a MAPI_E_NOT_FOUND access permission error for a user mailbox that was previously syncing:
2015-01-14 12:22:29,489 ERROR [CTP-cem #70] [38WYC2I8YHOG] Error occurred retrieving SOURCE_KEY property - attempting to extract from EntryID. Please Check User's access permission.
System.Runtime.InteropServices.COMException (0x8004010F): Error in IMsgStore::OpenEntry - 0x000000008CA881F822E67D4EB0290C4F3F7D258D0100475F51F99ACE974A95FE8AAF0CA8E7A0000000A816BC0000: MAPI_E_NOT_FOUND
Examination of the user mailbox in Exchange confirmed that the Delegate Full Access permissions to the Riva connection user for EWS had been removed.
Once the permissions were re-assigned, data sync resumed as expected.
Article ID: 1197
Last updated: 07 Aug, 2015
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Riva On-Premise - CRM Sync -> Manage Riva On-Premise (Admin Guides) -> Email Systems -> Exchange 2003 (MAPI) -> Errors & Troubleshooting