Disabled it in 3 ways, via the Device, using Desktop Manager (setting PIM to sync with Outlook) and via Policy.
Our support company have just informed me, they were able to reproduce the issue and they contacted RIM, who also were able to reproduce this behaviour
. RIM will be working on getting a fix for this, possibly a hotfix.
Its because of this issue also that it ignores any workarounds i.e. ways of disabling the wireless calendar sync.
so now its a waiting game ....