The doublenotes solution mostly works for those without travler as an option.
It isn't issue free though. I've found it most reliable if I sync one way with all updates done through notes. 2 way sync is hit and miss if too many changes in each direction. Not ideal, but gets me by.
I've also had the occaisional new calendar entry or calendar entry update not sync. I have to have a quick look at outlook to make sure the change got there. Once in 20 I need to edit the subject line or something to force a resync.
Pain in the arse, but sort of works when you can't get a server side change made.
Sent from my iPhone.