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I check my mailboxes and they are all mounted on my back-end server, but my front-end server mailbox store is not mounted because it doesn't store any mailboxes. &nbsp;<br />
<br />
I didn't start receiving the error messages until I upgraded to Exchange 2003.<br />
<br />
Should the mailbox store be mounted on my front-end even though it has no mailboxes?? Could that be whats generating the error message?? &nbsp;<br />
<br />
Thank in advance for your help<br />
Richard
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I check my mailboxes and they are all mounted on my back-end server, but my front-end server mailbox store is not mounted because it doesn't store any mailboxes.  

I didn't start receiving the error messages until I upgraded to Exchange 2003.

Should the mailbox store be mounted on my front-end even though it has no mailboxes?? Could that be whats generating the error message??  

Thank in advance for your help
Richard

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I gave the MS link about this problem, but without any feedback...
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I gave the MS link about this problem, but without any feedback...

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The MAPI call 'OpenMsgStore' failed with the following error: <br />
The Microsoft Exchange Server computer is not available. &nbsp;Either there are network problems or the Microsoft Exchange Server computer is down for maintenance.<br />
The MAPI provider failed.<br />
Microsoft Exchange Server Information Store<br />
ID no: 8004011d-0526-00000000 <br />
<br />
Ever seen this even error?? &nbsp;
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The MAPI call 'OpenMsgStore' failed with the following error: 
The Microsoft Exchange Server computer is not available.  Either there are network problems or the Microsoft Exchange Server computer is down for maintenance.
The MAPI provider failed.
Microsoft Exchange Server Information Store
ID no: 8004011d-0526-00000000 

Ever seen this even error??  

Event ID: 9175

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.