Outlook 2007 continuously losing connection to Exchange server...

One user's Outlook 2007 (Vista) is continuously getting the loss of connection to Exchange server error.  All other users are functioning OK--all others are XP Pro. I also noticed an event suggesting checking the exchange mailbox--'conincidentally' this same user was the cause of the event. All other connectivity is functional. What gives?  
FrankU09Asked:
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Tony GiangrecoCommented:
Start with the basics. I would upgrade the NIC driver and watch the connection for a while. If it persists, change the network cable and move to a different port on your switch. Note the port it was on incase it turns out to be bad.

If you are on Exchange 2003, make sure you are runnig SP2.

Let me know what happens.
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FrankU09Author Commented:
I have upgraded the drivers for the NIC, created new profiles, repaired Outlook 2007.
Interestingly enough, I created the profile on my laptop, and it worked fine--stayed connected and downloaded messages OK.  Changed cables, changed wall jacks--nothing.

I have been pinging the suspect Vista workstation (all other w/s's are XP Pro) and every one in a while it times out or jumps from 1ms to 64ms-115ms.  Could this be the problem?  What would case this--a defective NIC?

I am about to download an Exchange server hotfix for Vista that I just read about.

One last thing.  The same Sony Vista PC can access the exchange server over https fine, but not normally.  Is there any way to down-grade Vista to XP Pro? Boss purchased it because daughter that it was pretty. Hah.
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Tony GiangrecoCommented:
This sounds like a definate problem on the Vista box. If you have a spare nic, that would be my 1st choice. Other possibilities are spyware of anti-virus on the system that is using tons or resources and making Windows timeout.

You can't downgrade Vista. The quickest non-destructive way is to move your data to the server, replace the hard drive, inbstall XP and copy the data back to that  box (now runing XP).

Hope this helps,

TG
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FrankU09Author Commented:
I also tried to delete and rebuilt the TCP/IP stack.  No go.  The wireless connection has the same problem.  Although it may be the NIC, I don't think so now that we know it doesn't work wirelessly either.  Although it does work wirelessly over https as it did hard-wired. Tried a winsockfix for vista--nothing either.

I am going to take your advice and migrate his data to another drive with fresh XP Pro.  It has to be a Vista issue, becaue all of our other exchange users are OK and they have XP Pro AND his settings work on another XP Pro box with no connection issue.  Thanks for the advice.
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FrankU09Author Commented:
Turns out the the Microsoft Outlook Exchange Server Hotfix (KB 911829) did the trick.  It stopped the constant disconnect from exchange server issue AND the issue of not being able to reply when using outlook over http (everything else in Outlook over http had worked, just couldn't reply).

This problem was only with Vista workstations.
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