Ok... Yet another issue - I don't know if this is bad data that was loaded from Exchange, but I have a group of users that are getting the following message form the web client. We're running 4.5.5GA and Firefox 2.0 on all clients..
message - missing : after property id
fileName - http://zimbraserver.domain.com/zimbr...v=070503182959
stack - ()@:0
name - SyntaxError