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Problem with Hosted Exchange and a local PST file

I have a client who is using hosted Exchange.  She also has a local PST file providing a set of folders that she can drag emails into.  This PST file is in her Documents folder.  This documents folder is a redirected folder on the local server.

Every now and then, she:
1. Cannot expand the local PST because it's saying that she doesn't have a connection to the local server.  She does, and we can browse the documents in her documents folder.

2. Cannot expand the local PST after returning from screen saver.

How would I troubleshoot this?  There are 15 people on site, and only 2 people are having this problem so far.  Everyone has a local PST for archiving.
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DaveWWW
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More info:

I ran a repair on the PST and itr said there were no errors found.

When I remove the PST from the profile and attempt to add it back in, it generates a hexadecimal error number with "unknown error" or something like that.

When I copy the PST from her redirected Documents folder to her own "Downloads" folder on her oen local hard drive, it loads with no problem.  Of course this is not synced to the server so it is not a permanent solution.

So it appears there is a problem with getting the PST from the redirected Documents folder.  Anyone encounter this before?
Avatar of Barry Gill
it is a fairly well documents and talked about fact that accessing PST's from network locations does not work well.
I will do some digging to get you specifics, but basically the problems your user is experiencing are probably all related to the network access of the PST.
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Barry Gill
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We have network located PST files that are used for archival purposes that remain open in Outlook and do not have any issues. Some of them are approaching 4GB+ in size too.

The problem lies in the PST being in a redirected folder.

Offline Files and the local file cache do not like certain types of files such as PSTs or database driven files.

We use a network folder that Offline Files does not cache, has Access-based Enumeration enabled, and has exclusive permissions to the user to store those files.

We then have an exclusive and secured location that also has the benefit of being backed up.

Philip
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Thanks - that's pretty clear!  I'll probably move the PST to her local machine, and perhaps put the machine on a backup to the server in the middle of the night.