Vista - ActiveSync works but having trouble pulling Calendar items up to P

After seeing all the post of people having a heck of a time with Active Sync
and Vista, I'm feeling happy with 90% of what does work for me. However,
please help me figure out why my PDA calendar items won't upload into my
Vista PC's outlook app.

Currenly all my contacts came in, Tasks came in, Emails fine, and I can
enter a calendar item on my Vista PC and it will sync down to the PDA. But
again NOTHING in the PDA calendar will go up to the PC?

Additionally I have had this same PDA synching well with a WIN2k Laptop and
I'm wondering if that might be the issue - that the old laptop is somehow the
"master" and the new Vista PC is subordinate or something weird. Thanks if
anyone can help.

I recently upgraded to Windows Vista SP1 64-Bit and am experiencing the same problem trying to sync a Dell Axin X51v running Windows Mobile 5.0. I never had any problems running ActiveSync on XP.