How can I convert an .ost from Outlook 2003 to a .pst file? I have tried ost2pst.exe, but it does not support 2003.
Well, to begin with, there is an (expensive) program called Exchange Recovery 2.0 that claims to handle the new 2003 file
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If you can open the OST file in off-line mode, you can then create a PST and
simply copy the contents of the OST over to the PST. The trick here is opening
the OST at all since it is typically tied to a specific profile or Exchange
Server account settings. If that account is not available, then you may not be
able to open the OST.
A Google Search for “OST PST
conversion” returns several companies that provide for-fee conversion