Error opening Outlook 2007 after applying Service Pack 3

After running service pack 3 on Office 2007 of many of the clients at a business location, when users try and open up Outllook 2007 they get the following message that appears. The users click ok, the message disappears, they try and open up Outlook again. Sometimes it opens ok, sometimes the error message appears again. The users operate in a Small Business Server 2003 environment where they are synching their Outlook client with the exchange server on SBS 2003. The users inside the location network don't synch with Exchange, they just access right away when opening up Outlook. The outside sales force does synch, but usually they are already connected to a high-speed Internet connection where ever they are, so usually the opeing of Outlook for all users is seemless. The propblem with the error message appearing did not start until we applied SP3 to Office 2007. Here's the message "Microsoft Office Outlook offline folders: The file C:\ ..... (the path to the OST file)\Outlook.OST is in use and cannot be accessed. Close any application that is using this file and then try again. You may need to restart your computer.

Can anyone advise a fix for this problem. Thanks in advance.
zargf8nsAsked:
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Raymond PengSystems EngineerCommented:
Did the users reboot after service pack was installed?  I believe this happened with SP1 and if communicator was running, you needed to free up the DLLs.  Try rebooting the client machines.  

You could try deleting the OST file on one machine and have it resynch with the network again and see if issues persist.

http://support.microsoft.com/kb/943590
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zargf8nsAuthor Commented:
We ended up deleting the OST file and recreating it. That fixed the problem. Thank you for your feedback.
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