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Event ID: 1021 Source: MsExchangeIS

DOMAIN/USERNAME was unable to connect as /o=Organization/ou=OrgUnit/cn=Exchange/cn=User Alias. Error <error code>
- Error code: 0x4de (Mapi sessions exceeded) - In my case, it turned out to be that one of our engineers had attempted to enable RPC over HTTP. Once RPC over HTTP was disabled, and the Information Store was restarted, the client worked properly.
From a newsgroup post: "Error code: 0x80040111 I fixed the problem by recreating missing System Attendant mailbox".
- Error code: 0x503 - This error occurs when someone tries to connect and Exchange is out of licenses.
See MSEX2KDB for information about this event.
Error codes:
- 0x3f2 - An error reading the hard disk. This issue can occur when you do not have the correct NTFS file system permissions on the Exchsrvr folder on the Exchange Server computer. See ME249892.
- 0x80040111 - MAPI_E_LOGON_FAILED = An unsuccessful logon attempt when you query the directory. ME278966 might help?

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