I had a problem user (don't we all?) that his calendar would always sync
initially for his first sync but nothing afterwards.Another user, samething
except it was his inbox (mailbox).

The common factors? The user with calendar sync issue calendar into
another folders other than the standard location and likewise with the
other, he had moved his mailbox to his documents folder.

Moved Calendar and Mailbox back to the default locations and it appears to
have fixed their sync problems.

What's different with the Mobility process that does the initial sync
compared to the update sync process?