Dear All
Hope this is in the right place but we are seeing the same sync issues as you.
We have just discovered that many of the users are missing the "anonymous" permissions from the outlook Calendar on the client side.
Replace this and after turning off and back on the wireless sync option in the calendar it seems to work fine.
Just confirming this with RIM and will post there reply..
Reply from RIM
Outlook can only open a calendar if you have read access to it. The ability to see whether a time slot is busy is not enough. Note that the attempt to open is done in your name, so the owner of the calendar will need to give you permission to read, or they will to select "Anyone can read my calendar".
When you schedule a meeting in outlook, you can look at what time the invitees are busy. That is done in a different way from opening calendars. In particular, the access is done as the anonymous user. For outlook to see free/busy information, the calendar must permit everyone (specifically, the anonymous user) to see availability. In the Unified web client, this is "Anyone can view my availability".
Stuart