i got 2 more errors like i had before it then stopped. only to be replaced with
CalICSSynchronizer::Synchronize - Synchronize failed: (0x80004005), step 0/0 and
DoICS() failed: ERR_FAIL
CalICSAgent::Synch: Could not synchronize for user
i have since moved 3 more users from exchange 2007 and 2010 without any issues.
found this article
KB22637-"CalICSSynchronizer::Synchronize - Synchronize failed: (0x80004005)" appears in the Windows Event Viewer
seems a bit far fetched to me that this is the issue here. i will wipe the handheld device when get a chance and redeploy. hopefully that will sort it out, in the meantime the device seems to be working fine