just wrapping up this thread:
He was running a OpenVZ package - suggestion in per the other thread
http://www.zimbra.com/forums/install...html#post62510 is that he file a bug with their community if it really was not included (and not just something that got de-selected on install).
-However you can always also file in zimbra's
bugzilla if you desire, so that someone else down the line doesn't get this problem.