Microsoft Outlook 2002 and earlier versions limit the size of Personal
Folders (PST) file to 2GB. Whenever the PST file reaches or exceeds
that limit, you will not be able to open or load it any more, or you
cannot add any new data to it. This is called oversized PST file
problem. More detailed information can be found at
http://www.datanumen.com/aor/problems/2gb-pst.htm

You can use Advanced Outlook Repair to solve the problem, by either
converting it into Outlook 2003 format ( http://www.datanumen.com/aor/problem...rt-2gb-pst.htm
), or splitting it into smaller pieces ( http://www.datanumen.com/aor/problems/split-2gb-pst.htm
)

http://www.datanumen.com/aor/ contains the detailed information about
Advanced Outlook Repair.

And you can also download a free demo version at http://www.datanumen.com/aor/aor.exe

Alan