The process (presumably used to synchronize contacts with the Apple software, which syncs to iPhone,) was no longer present and the install proceeded.
The fix was to turn off Sync Services in MS Office for Mac 2011's preferences, then Restart. I tried killing it in Activity Monitor, but it comes to life like a zombie. It would hang with a message that the sync server process was in the way. MacFixIt reader 'jsylla' wrote in with a potential easy fix for people who are experiencing installer hangs when updating: I could not get the 4/12/11 update to install. Turn off sync services in Outlook's preferences
