Outlook randomly disconnects from Exchange 2007 Server

I have an Exchange 2007 server that hosts multiple databases. There is one group of employees that seem to randomly lose connection to the Exchange server at the same time. When they lose connection they do not lose any other network connectivity. In fact the network tech found that there were no dropped packets when connectivity is lost. Another point of interest is that they all lose connectivity at the same time. The disconnect only lasts for a minute or so but it seems to be happening more frequently. No one else in the building is experiencing this issue. The only difference is the fact that they are on different databases on the same server. I have checked the event log on the exchange server and I find no errors that would account for this behavior. I have searched the databases on this website but have not found a solution as of yet.  
greywindAsked:
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eggwisConnect With a Mentor Commented:
Try creating an entry for your Exchange server in your hosts file  (C:\WINDOWS\system32\drivers\etc\hosts)   Then run nbtstat -R from the command prompt to clear cached lookups. This will eliminate any possible DNS issues.

Also, try enabling NetBIOS over TCP/IP rather than letting it get it's setting from DHCP

keep us posted...
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vdevine15Commented:
What OS and Service Pack are the users on, do they have all similar equipment, same patches recently rolled out?

Has this issue always happened since you've had Exch 07?
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InderjeetjaggiCommented:
Check for event log and try to run EXBPA on exchange server

Also check below articles
When you use Outlook with an Exchange 2007 mailbox, you cannot connect to Exchange 2007, and you receive an error message :
http://support.microsoft.com/kb/924625

Error messages when you try to connect Outlook 2007 to Exchange Server: "The action cannot be completed" or "Your Microsoft Exchange Server is unavailable" or "Cannot start Microsoft Office Outlook"
http://support.microsoft.com/kb/913843


Hope it helps

Regards
Inder
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eggwisCommented:
What version of Outlook are clients running?     ...and is the rest of the compnay ALL running the same version?   ...w/ same SP rev.?
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greywindAuthor Commented:
I am told that they are not sure how long it has been going on. At least a couple of months. As for the version of outlook I will have to find out later today. There is a mix of Xp and Windows 7. All display the same behavior.
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vdevine15Commented:
so its not OS related.  how did you verify that they are not also losing connection to other resources during that time?  my next concern might be related to the switch they're connected too.
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greywindAuthor Commented:
I am told that they are not sure how long it has been going on. At least a couple of months. As for the version of outlook I will have to find out later today. There is a mix of Xp and Windows 7. All display the same behavior.
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greywindAuthor Commented:
I went ahead and added the host entry and ran the nbstat command on the workstations that were displaying the issue. So far the disconnect has not occurred. I will test another day.
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greywindAuthor Commented:
I have not had any complaints since the host file entry. I will consider this issue resolved. Thanks for the help.
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