Users are getting message on LAN that outlook is trying to connect to exchange server

we're running 2003 exchange standard edition- the priv1.edb and priv1.stm total 80gb-  i used the microsoft
registry fix to increase to 75 gb- we will be upgrading to enterprise within the next week or so but in the meantime,
users are constantly getting the message "outlook is trying to connect to exchange" -  these users are on a 100mbps
lan, same subnet, server is in the same office ( single D.C controller)-
some of the users have very large mailboxes, one user had 13 gb mailbox, i had her archive but this is a law firm
that handles class action law suits and their required to keep emails from 5 years. when i archived her mailbox ( pre-archive mailbox was 14 gb) after archiving it's  7 gb.  problem is the archive.pst  file is so large that it hangs-up
her outlook when opening. (she is running outlook 2003)- i tried running scanpst but it keeps failing the repair.

as a work-around, i turned off exchange cache mode and this helps slightly-

my main questions are:
1.) is their a limiit to the size of a users mailbox and what is recommended?
2.) what is the limit on the pst file ( archive.pst) when running outlook 2003?
3.) how can i get outlook to work better/ exchange- when they need to keep so many emails, Folders in their inboxes
, archiving is not doing the trick.
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Assuming you have no networking issue, there isn't much you can do before you upgrade. I don't think there is a limit on mailbox size but of course the larger the mailbox the longer it takes for indexing.

Outlook 2003 don't have a limit on pst file size (it was 2Gb pre-2003). However I heard a lot of complains about pst where it goes over 2Gb. It let you open it but it is kind of unstable.

Have you considered using more than one archive or pst files for the user? For example, have a pst file for each year hopefully it will break down his/her 7Gb pst into 5 x 1.4Gb pst files?

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I think you should also consider clustiner your exchange server, how many users are we talking? mail boxes 13GB in size are always going to give you problems.
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