This afternoon I picked up my Treo 700 and realized that my Outlook e-mail account did not sync for two days.  Two days!!!  Turned out that the Hotmail account was the main account in Messaging.  Reminded me of an old bug.  Messaging can only start sync in the main account.  So if you would like an account to stay up-to-date then keep it selected in Messaging. 

Zeeshan Hamid