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how can i figure out why we need to restart the exchange services almost every morning?!

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What are the symptoms? Are the services failing overnight? What version of Exchange are you talking about? –  Daniel.S Feb 8 '11 at 9:30
    
@Daniel.S version is in the tag: Exchange Server 2003 –  splattne Feb 8 '11 at 9:31
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up vote 3 down vote accepted

In general the place to start is log files, starting with the event logs specifically the Application log in regards to Exchange.

If I had to guess at the problem I'd check on your exchange database size. One symptom of hitting the database size limit is the database going offline/being dismounted.

By default Exchange 2K3 has a size limit of 18GB. SP2 raises that limit to 75GB for Standard Edition. Note that after installing SP2 the limit does not automatically raise to 75GB the limit is still set to 18GB you have to increase it.

If size is the problem you should see an entry in the Application event log. Also make sure that transaction logs are not filling up the disk.

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I used to support Exchange professionally, and I agree with Leroy Clark. The Application Event Log is the place to look. –  Mark Allen Feb 8 '11 at 8:14
    
it seems like a MAPI session is the one for the failure... how can that be helpful for fixing?? –  Y.G.J Feb 9 '11 at 15:26
    
MAPI error is not the reason, there should be more errors. –  Vick Vega Feb 18 '11 at 14:51
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