There was one thread already in the knowledgebase that proved unhelpful. I'm using Outlook 2003 and the recurrence buttons for tasks is greyed out.
I also tried changing the file name extensions on the outcmd.dat and extend.dat files, in the Applications and Settings folders. This was a solution I tried once before (per the MS website) and it worked. However, this time, I think I only succeeded in adding an extra extension to the names, i.e. I didn't actually change the extensions.
Regardless, I'd love it if someone could help me on this one.