Exchange 2003, event 1023, how to find message ID.

Feb 23, 2015 at 9:55 AM
I've got annoying problem with following errors in event logs on SBS server: "Error 0x7da occurred while rendering message 0001-000001005cc2 for download for user xxx" (source: IMAP4SVC).
User doesn't know about any unreadable supiscious mails and I didn't manage to locate any message/calendar which was received about time that first error 0x7da occured in logs

I've read that I can use mfcmapi and Instance Key attribute to match message id and delete it, so I went IPM_Subtree of xxx user and I was opening each folder one-by-one, but Instance Key is in following format:
cb: 4 lpb: 002C4584, its always lpb: 002xxxxx,
there is nothing that can match 0001-000001005cc2 or 0001-000001005f33 or 0001-000000fc782d.
Could you give me a hint how to solve this issue or how to find particular message be ID?