As Handler Queen Lorna Hutcheson points out, since Win2K, you can filter outbound using the so-called IPSec filters of Windows. However, such filters are:
1) Really badly named -- they don't have to use IPSec crypto;
2) Really hard to define (what an ugly GUI); and
3) Not limiting to specific applications to use specific ports and protocols. So, the existing outbound filtering of Windows is extremely limited.