Unable to log out from OWA

In our environment, OWA is only available internally.  However, there is a mailbox that multiple people must work from in addition to their own.  The way we have chosen to work is to have this mailbox open in OWA.  Unfortunately, on one computer only, it logs the user straight into their own email.  If you click log out, it goes to the standard logged out window that tells you to close internet explorer.  Next time you access the OWA address, it takes the user straight in to their webmail without asking for userid and password as if you had never logged out.  On all other profiles and computers everything works fine.  I tried recreating the cached profile on the client, but it made no difference.  Any ideas?
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Stephen CroftTechnical ArchitectCommented:
Can I ask why you are using OWA to share a mailbox? Why not share the mailbox out and open it as a secondary for each user who requires it?

As for the OWA problem, is the machine part of your AD domain? Are you using "Integrated Authentication" in Internet Explorer? Have you cleared out the local profile's temporary internet and cookies (you mentioned profile, just have to clarify)?

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use2itAuthor Commented:
I completely agree with you when it comes to sharing the mailbox.  Unfortunately, i am not the primary technician here.  He is on holiday, so i am unable to change the way people work from that perspective until he gets back.  I have cleared out cookies, temp internet files.  I have even renamed the old profile and recreated it (automatically) without success.
What do you mean by Integrated Authentication in Internet Explorer?  Do you mean IIS, or is there a similar setting in Internet Explorer?  This computer is using IE6.  I have cleared out all passwords and usernames from the cache in IE.
Stephen CroftTechnical ArchitectCommented:
I feel for you mate :)

Integrated Windows Authentication is under Internet Options --> Advanced --> Security.

It passes on the currently logged on user to OWA to "auto-login" them if I remember correctly. :)
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use2itAuthor Commented:
Thanks,  I will check it first thing tomorrow morning as i am not able to access the computer in question today again.
use2itAuthor Commented:
The strange thing though, is that all other computers have this option checked, mine included, and yet they don't react in this way?
Stephen CroftTechnical ArchitectCommented:
Does the machine you are having issues with have it checked?

Do you get prompted for a OWA login when you hit the page?

Is there any third-party addons installed (ie Google Toolbar etc).

Does it happen in IE and Firefox?
use2itAuthor Commented:

I dont know if it has it checked, i only have access to the computer again first thing in the morning, due to the fact that the user requires it to work on for the rest of the day (deadlines etc).  They don't get prompted for a OWA login when they access the page, it just takes them in.  There are no other 3rd party addons installed.  We are not allowed to install an additional web browser onto the computer even for diagnostic purposes due to standardised software :(
Stephen CroftTechnical ArchitectCommented:
Probably best to check tomorrow then and take it from there.
use2itAuthor Commented:
I have decided just to change the way that the users work.  They all agree that this would work better for them than the waý they currently work anyway.  Thanks a lot.
Stephen CroftTechnical ArchitectCommented:
Many thanks for the points :)
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