To my knowledge, there isn't a limit on number of .PST files you can create.
As to other limits:

http://support.microsoft.com/kb/830336/en-us
The .pst file has a different format and folder size limit in Outlook 2007
and in Outlook 2003

Hal
--
Hal Hostetler, CPBE --
Senior Engineer/MIS -- MS MVP-Print/Imaging -- WA7BGX
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"John A Hansen" wrote in message
. ..
Dear All:

How many *.pst files can be handled in OL 2003 ( 20 gig limits) ?

In OL 2000 we had a 2 gig limit and I understand that the OL 2003
now has a 20 gig limit.

We could create an unlimited number of *.pst files in OL 2000 , but
not sure if that is also true in OL 2003 ( and 2007) ?

I use a separate *.pst file for each major category of work that
I do since there is video attachments etc etc.

Thanks for your assistance.

Best Regards
John A Hansen