Wirelessly posted (BlackBerry 8700g: BlackBerry8320/4.2.2 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
Gotta be something with that 666 number after the 1. I would try adding one more appointment to make it 1667.
Honestly, not sure what is happening. What version of Outlook are you using, and what version of the Desktop Manager are you using?