Outlook 2007 keeps getting disconnected from Exchange 2003

Do you have other Vista clients?
Have you tried disabling IPv6?

http://support.microsoft.com/kb/929852

I haven't tried disabling IPv6 yet.  But yes there are several Vista clients with more to come.  That's just another reason to get this going.

Could you qualify what you mean by "keeps getting disconnected"?  Are you seeing error boxes, alert messages, or password prompts?

Justin

No error boxes/messages.  The lower right hand corner of Outlook just says "Disconnected".  
Tried:

1. Rebooting
2. Enable/Disable account on Exchange & our PDC
3. Disconnected most of her mapped drives

I'm stumped.

Have you tried either updating the NIC drivers or rolling them back to a previous version?
Can you access the web / LAN happily?

What Anti-Virus software is running on the problem client?
Any non-Windows firewall software installed on the newly built Vista PC?

Web and network are absolutely fine, not one issue.  I can ping everything under the sun in and out of our network.  
 

Firewalls are external CheckPoints.  Anti-virus is Trend Micro hosted on our server's with a client version running on each workstation.  I did disable that and the problem was still occuring.

Do other users in her storage group suffer from the same problem, or is it isolated to this one user?  What is the size of this user's mailbox in relation to the others in your organization?

Isolated user.

Did you see my question about Updating / Rolling back the NIC drivers?

I did see it.  Woudl it really apply though, if the rest of the connections are ok?  (internet, network)

I would still like to rule it out.  Yes it is unlkely, but stranger things have happened!

You said it alanhardisty.  I will try this tomorrow.  I am also going to try unjoining and rejoining her to the network.

Thanks - will try to think of other alternatives so you can have a list to work with ;-)

The first thing that springs to mind is can you login on the PC as another user and configure Outlook happily?
In addition, can the problem user logon to another PC and setup outlook happily?
This will help point the finger of blame to the PC or the account.

Alan is going the right direction.  Let's figure out if it is a server/maibox issue or a computer issue.  Also, uninstalling Outlook will not always get rid of created mail profiles.  I don't want to operate on an assumption.  Have you manually removed any existing mail profiles and rebuilt them?

Justin

Sorry for the delay fellas, I was out of the office yesterday.  I visited this user the other day and tried updating her NIC, but the drivers are all up to date.  
This is something she actually brought to my attention.  This all started when I mapped a drive from her PC to her boss's PC.  She's on Vista, her boss on an old XP machine.  I'm not sure that has anything to do with it, but after I've disconnected that drive, the issue seems to be gone.  I am going to double check with her to see if it's happened since.  
Thoughts/ideas on this?

That's a random one!  Nothing exciting springs to mind - I'll have a think and come back.

I would suggest that was completely coincidental.

Wow!!!  Unbelievable.  Something else to possibly consider.  
This user keeps locking herself out with password attempts.  Again, she's the ONLY one in our organization and asks about 2-4 times per day. Her password doesn't change and it's the same on our Exchange server as it is on our PDC

I would suggest she has some sort of malware/virus on her computer which is locking her account out which is causing the outlook disconnections because of authentication.

Either that or she is logged into another machine somewhere and changed her password since logging in.  I would certainly check the machine for malware (virus and spywayre/rootkit), as demazter suggested.  Also make sure she is logged into only one computer.  If you see bad password attempts in your DC's event log, try to track down the machine passing the handshake.  Mapping a drive to her boss's XP machine is not problematic, from any Windows OS, really, especially is permissions were set up from domain and not local accounts.  In my opinion, they should both be accessing a share on a server instead, but that is just an opinion.  I don't like shares on my workstations.  Overhead is a pain.

Justin

Checked the event log.  3 security audit failures on her account corresponds with the time she called me earlier today. All coming from her IP address which I know is her machine.  Nothing else after/before that.  
I haven't run a virus/malware scan as of yet but will do that next.

on a completely different node, try changing NTLM settings to v2.

secpol.msc in RUN command and go to network lan manager authentication level. change it to the longest one in the menu and apply and see if that makes any difference.

you need to do this on vista workstation.

@idevil: Where in the trees can I find the network lan manager auth level?

I'd be suprised if this was causing the problem ita more likely to be malware/virus