Outlook 2003 .ost maxed out and I cannot delete any emails

Environment: Exchange 2003, Outlook 2003

I appear to have maxed out my .ost file, even though it appears to only have 487MB of emails in it. I have tried to permanently delete my "deleted" and "spam" emails, but every time I try, I get the max warning message to delete some emails! I also get the Mailbox Cleanup message box and when I attempt to delete emails in folders from the buittons on the Mailbox Cleanup message, I get the max warning message. I call this recursive frustration. On the exchange server I have no limits on mailbox sizes.
I have rebooted my workstation and my exchange server. Any suggestions?
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Glen KnightCommented:
You will have to do SHIFT+Delete on some messages you can remove.
PWyatt1Author Commented:
Shift+delete doesn't work. Any other suggestions?

BTW I did a repair using on the Outlook 2003  using the Office 2003 disk, but Istill get the same errors.
Use Scanpst.exe , installed along with OUtlook, to sacn and fix your PST/OST files.

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Forgot to emntion that Microsoft has a tool to fix oversized PST/OST.
PWyatt1Author Commented:
thanks rvivek: I ran scanpst.exe. Same result.

I downoaded and tried to run the crop program, but the file in question is an .ost file, not a .pst.

Any suggestions?
Since you are working with exchange just turn off your offline caching.  This will make it so you don't use much of an ost if any at all.
PWyatt1Author Commented:
Hi Rvivek and Micalkin:
I wanted to keep the offline caching of my mailbox for the speed.
I fixed the problem myself.
I went into the registry to HKEY_CURRENT_USER\software\microsoft\office\outlook\pst and increased the MaxFileSize to the maximum allowable size of 0xffffffff. I then set the WarnFileSize about 10% less and then rebooted.
I was then able to delete the contents of my "Spam" folder and "Deleted" folders.
Thanks again for the help. I'll split the points 175 to Rvivek and 75 to Micalkin
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