Serial Mail: Bug in OS X may trash your Address Book database

Serial Mail
During the last half year I had three reports of users completely losing the contents of their Address Book while working with Serial Mail. The problem is not related to Serial Mail, it is due to a bug in Mac OS X, presumably the SyncService. There are many reports of this problem in the Apple discussion group. From these reports it appears that the problem comes form a sync (like iSync) conflicting with another application trying to access the Address Book.

As a precaution when using Serial Mail, please backup your Address Book database. It is just one click to the File menu of the Address Book application.