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Whaddya know how to solve Unable to open your default e-mail folders?

"Unable to open your default e-mail folders. The Microsoft Exchange Server computer is not available. Either there are network problems or the Microsoft Exchange Server computer is down for maintenance."

The error above is common in Exchange Server community but still a puzzle to solve by other system administrator or exchange administrator. This is a quick guide what to check if one of your user complain that he/she can't access your email server.

It is obvious that you have a MAPI connection issue, so start by checking the Event application viewer of your Exchange Server. You should be able to see the read error for MSExhangeIS (source). When you double click this error, here's a sample description:


Event ID: 9646 and Source: MSExchangeIS
Mapi session "/o=KINGNET/ou=first administrative group/cn=Recipients/cn=johnsmith" exceeded the maximum of 32 objects of type "session".

To reset this issue, you can reset the session of the user connecting to your exchange server.

"To resolve this issue, we recommend that you first determine whether the MAPI session limit is reached because of potential abuse, because a large additional mailbox was added, because it is the result of a bug in a client program, or because of client program design. If the issue occurs because a large mailbox was added to a Cached Exchange Mode profile in Outlook 2007, you can disable the new Outlook 2007 default feature that causes this issue. To do this, follow these steps." (2009, support.microsoft.com)

Sometimes, recreating the outlook user profile will solve the issue. This is because, you are closing the user's session to your exchange server.

If you have other questions post it here.

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