Exchange 2007 IMAP stopped working

We have an Exchange 2007 server with some IMAP accounts for secondary domains.  All has been well for a month or so. Suddenly whilst Exchange email is working correctly, we have lost IMAP email. If a user clicks on their IMAP inbox they get asked for their IMAP account password, but re-entering that does not help.  The IMAP4 service is running on the Exchange server.
CharApAsked:
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SembeeConnect With a Mentor Commented:
That error code will not have anything to do with it.

It is most likely something with IMAP service or the account.

Ensure that IMAP is responding, telnet to port 143 or 993, depending if you are using SSL. If it is, then it could be something outside of IMAP.
Try a test account or create a new account and see if that works.

If it was working, then check the accounts - password expired, locked out etc. IMAP accounts don't see the password expiry prompts you would get if you were logging in to the accounts with Windows.

Simon.
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CharApAuthor Commented:
Just run the Exchange 2007 Troubleshooter and get one failure event. NOt sure how to decipher this screen but the relevant section it appears as:

EXCHANGE
  ServerName =EXCHANGE
  Win32_NTLogEvent.Logfile="Application",RecordNumber=800
  TimeWritten =20071009161603.000000+060
  Message =Watson report about to be sent to dw20.exe for process id: 4256, with parameters: E12N, c-rtl-AMD64, 08.00.0685.024, exschema.exe, exchmem.dll, 4223, c0000005, f5ae, 08.00.0685.024  
  SourceName =MSExchange Common
  EventCode =4999
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CharApAuthor Commented:
Thanks Simon
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