You may need to uninstall Office and reinstall it as the system administrator. It sounds like certain permissions in the program were not translated correctly when you performed the upgrade (another argument against in-place upgrades as opposed to clean installs!)
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Related Q&A from Serdar Yegulalp, WinIT
Frustrated admins have been dealing with extend.dat error messages since Outlook 97. Our expert sheds some light on this all-too-common Outlook error.continue reading
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