Outlook offers four basic recurrance settings: Daily, Weekly, Monthly,
Yearly.  

I suggest adding "Quarterly."  Many federal government reports are required
to be made quarterly as well as many private industry activities occur each
quarter.

Sub-options for recurrance might be:
x Day of the quarter (x = first, second, third, last, etc)
x Workday of the quarter (x = first, second, third, last etc.)
x Week of the quarter (x = first, second, third, last, etc)

Retain the start/end type of options used currently.