Limited Connectivity in exchange 2003

Email worked fine last night, we arrive today and nobody is getting mail, and exchange has limited connectivity.  Where do I start?
dannyboy266Asked:
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manav08Commented:
IS that the only event logged -

Try this first -

http://www.msexchange.org/tutorials/Exchange-ISINTEG-ESEUTIL.html
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manav08Commented:
check the event logs on the server and post them here. Someone will help
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dannyboy266Author Commented:
Here's one of the errors.  Yesterday our mail went down until we fixed our public MX record, but worked all day after we had that changed, now it went down in the middle of the night?  Our mail server is complaining about low disc space on 1 drive that has the pub and priv folders on it however, would that do this?

The MAPI call 'OpenMsgStore' failed with the following error:
The attempt to log on to the Microsoft Exchange Server computer has failed.
The MAPI provider failed.
Microsoft Exchange Server Information Store
ID no: 8004011d-0512-00000000
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manav08Commented:
This can be the issue too - http://www.msexchange.org/tutorials/Explaining-Database-size-limit-changes-Exchange-2003-Service-Pack-2.html

Restart your Microsft Exchange Information Store service and check the event logs logged to make sure there are not any more event logs
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dannyboy266Author Commented:
Looks like the drive where the .edb files are on is the one that ran out of disc space last night....I moved some old backup files from it and mail started delivering again.
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dannyboy266Author Commented:
For some reason all the backups of the databases were stored on that drive too, taking up tons of space, so I'm moving those off the server, should be fine now thanks guys.
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manav08Commented:
No worries. Just remember to accept the answer that helped you fix the problem
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