I just noted a behaviour I would not see as how I would like it.
If I receive an email (in the inbox) and it synched to my mobile (Motorola Milestone) it will stay in the inbox of the mobile, even if I move it to an other folder on my win32 client.
I would expect that it would vanish from the inbox of the mobile after I move it in my win32 client, but my expectation might be wrong...