Backing Up .PST Files to a server

We are running windows 2003 exchange server which we all know has a limit of 75 gigs for the storage cache file. With about 160 mailbox users we are getting very close to the 75gig limit.

As an attempt we have instructed our users to make a local .pst file and to start managing their mailboxes. The problem with this is that since most of their emails are on a pst file on their local machine this means they weren't getting backed up.  To fix this problem we moved the pst files of the desktop users to a server which is backed up everyday.

Now for the problem. We have Laptop users who cannot be setup this way because they are contently coming in and coming out. For their documents we have them synchronize to the server when ever they boot up or shutdown on our network. We all know that the Microsoft synchronizing utility does not allow synchronization of a .pst file. I am looking for a solution to have this file synchronized like all the others.

Does anyone know of a third party software or simply of a way that we could synchronize peoples pst file?
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I'm in the same boat, and for the majority of the heavy users, they are instructed to copy a Zip of their PST to the network after they have manually (not auto) archived (usually done on a quarterly basis).  Have you looked at Microsoft's Personal Folders Backup Addin for Outlook 2002/2003?  I don't use it anymore, but as I recall, you could specify the PST to backup (and the target location) when the user closes Outlook.  The cons are that it's more admin for you and the user, it is user defined (not enfored through GPO), the user can cancel the backup, etc.  The pros it's free, and when used correctly could _aid_ in getting PSTs backed up.

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Matthew MillersCommented:
Have you considered using a third party archiving solution such as Symantec Enterprise Vault? There are many benefits...

1. Remove PST files
2. Allow end users seamless access to vaulted mails from outlook
3. Can access from laptops using a offline copy of their vault
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