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SBS 2003 R2 Exchange Error - 'OpenMsgStore' failed... attempt to log on to Exchange Server failed.

SBS 2003 R2 Exchange Error -  

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

I only have one test account in Exchange... so I do not have to worry about any Exchange email or other
types of Exchange data.  Is there an easy way to reset or just delete the message store?  Right now, my test account has about 1.5GB of test data.  I have deleted it and emptied it.. it will not go away.
2 Solutions
Stephen MandersonCommented:
Hi there,

This issue can occur if the information store is not running. When the information store is stopped and the System Attendant is still running, the System Attendant keeps the MAPI session active. This issue can also occur if a mailbox store failed to mount.

To resolve this issue, verify that the information store is running. If the store is not running, attempt to start it. If the information store is running, and the event is still logged, verify that the mailbox stores are mounted. If they are not mounted, attempt to mount them.

Take a look here at this ms knowledge base article.

Also this may be of some use to you.

Kind Regards
smarianiAuthor Commented:
All Exchange Services were stopped.  Rebooted my Small Business Server and now all Exchange services up EXCEPT the Exchange MTA STACKS is stopped.  How do I start it?

Also,  my System Mailbox has a bunch of mail.  Why would it  have over 138 emails?  Is there a way
to purge all the email boxes, or manually delete the 1.4GB in my priv1.edb file.   Is there an easy way to just start fresh and reset all the boxes?
Exchange MTA Stacks is mainly used to connect to Exchange 5.5 servers.  It can also be used for other X.400 compliant messaging systems.  Normal Exchange 2000/2003 operation does not require it to be running.

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