A few weeks ago I mentioned a work around for the Quick Click category bug, where the category is not saved when Outlook 2007 closes.

It (and a long list of other bugs) is fixed in a new hotfix:
Description of the Office Outlook 2007 hotfix package (Outlook-x-none.msp): October 27, 2009
http://support.microsoft.com/?kbid=974994

I recommend reviewing the KB article for all the issues that are fixed by this hotfix as it addresses a lot of problems, including issues opening *.msg attachments, several calendar issues, dismissed reminders returning and more. Lots more.