Outlook 2007 Exchange and Cache Mode

I have a user with a mailbox that is 6GB and on exchange 2003. When he opens outlook since it has to pull everything down it opens slowly. I would like to set him up with cache mode but I'm concerned about 6gb being a problem. Does anyone know if a 6gb mailbox in cache mode outlook 2007 will cause a problem.
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The UNICODE format used by Outlook 2007 by default supports up to 20GB PST and OST file size, but even that limit can be increased if needed:  http://support.microsoft.com/kb/832925

A 6GB mailbox is on the smaller end of what I see day to day at clients for large mailboxes (have seen a couple 45GB mailboxes in just the past few weeks) so you will be fine.  In fact, it's recommended to run in Cached Mode, just give the workstation plenty of time to perform the initial full synch.

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