I'm not sure on WM 5, but 6.1 & 6.5 have a little barred icon in the upper right corner for easy access. I have a Cingular 8525 with WM 5 sitting in the drawer, but it'd take me longer to charge it than it'd take you to Google the info.
I am not sure I have used Plan Plus for Outlook and tasks was always on the today screen. Now using PPO with the built in addin for Pocket Informant 8.