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Outlook will not connect to Exchange server after coming back from remote office on same network.

Running Exchange 2007; clients are on Outlook 2003. User has no problems connecting to Exchange server while at the office. User goes to another site at the same company and logging onto the same domain. When user returns to home office, he is able to connect to Exchange for and hour or two and then Outlook disconnects and is unable to connect to Exchange server. If left alone, it eventually starts working after anywhere from 2-6 hours. I can delete the mail profile, add a new profile with my username and it tries to connect but the user does not have access to my mail so no mail comes up. I can then delete that mail profile, add User's mail profile back and it then connects.....but most of the time, it will drop the connection again after an hour or so. What could possibly be causing this? Exchange mailbox store is at home office only, and there is a DC at each remote location. AD replication is, for the most part, 15 min intervals. I should also mention that this was happening before we upgraded to Exchange 2007 and were still on Exchange 2003 with Outlook 2003 clients. Please ask what other information you may need to help me resolve this issue.
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Precision-IT
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Precision-IT
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sanjaykumar_pCommented:
Does it pop up for authentication before status changes to Disconnect? Have you checked what does it shows at Outlook Connection Status (Hold control key and right click outlook icon in tray ) ?  Have you also checked if the PCs are hard coded to use specific GC ?
http://support.microsoft.com/kb/319206
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Precision-ITAuthor Commented:
It does not prompt for authentication before it disconnects. Outlook connection status just says its unable to connect to the Exchange server. I can ping the Exchange server from the machine that won't connect. The PC's are not hard coded to use a specific global catalog.
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sanjaykumar_pCommented:
Not sure how come user is able to access for an hour and then disconnects, just a guess, have you checked exchange servers event logs ? It may relate to Mapi Sessions exceeded the maximum allowed, Event ID 9646
http://support.microsoft.com/kb/842022
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Precision-ITAuthor Commented:
No one wants to make any changes to the server. They want to wait and see if upgrading to the Office 2k7 client is going to fix it??? I will reopen if needed. Thanks for the help guys.
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Precision-ITAuthor Commented:
This mysteriously stopped happening. We did nothing to the Exchange box. May have been something with the Checkpoint VPN site db.
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