Activesync is a conduit software that connects a PPC with your computer (available for free from Microsoft). Normally you can only sync with Outlook with this software.
No matter what software you use to sync Notes, you will need Activesync to create the connection between the device and the computer.
I would suggest Intellisync Handheld Edition 5.5 which allows a PPC (including WM5) to synch with all versions of Lotus Notes (including 7.0).
http://www.intellisync.com/pages/Pro...r-Individuals/