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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:<br />
<br />
EXCHANGE <br />
&nbsp; ServerName =EXCHANGE <br />
&nbsp; Win32_NTLogEvent.Logfile=&quot;<wbr />Applicatio<wbr />n&quot;,RecordN<wbr />umber=800 <br />
&nbsp; TimeWritten =20071009161603.000000+060<wbr /> <br />
&nbsp; 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 &nbsp;<br />
&nbsp; SourceName =MSExchange Common <br />
&nbsp; EventCode =4999 <br />

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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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We have an Exchange 2007 server with some IMAP accounts for secondary domains. &nbsp;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. &nbsp;The IMAP4 service is running on the Exchange server.
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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.

Exchange 2007 IMAP stopped working

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.