I have TB client v91. I use a company Zimbra email server for my email. I have a TB account setup for IMAP to this Zimbra email server. I can view email via my PC, a browser, or my iPhone. All my email is synchronized on the Zimbra server which my TB client and iPhone connect to. My TB calendar is different, as it is the main calendar. I post events to this calendar. When I create a new calendar and point it to the Zimbra server (and call it "Business Calendar", with the proper credentials, I can create an event on Zimbra that will eventually appear on my TB client. However, if I create an event on my TB client to my "Home" calendar it doesn't appear on the Zimbra calendar (which doesn't show on a browser nor my iPhone. If, however, I create the event on my TB client to the "Business Calendar" calendar then this does show up on Zimbra. Clicking the Synchronize Calendars option in the right-click menu doesn't do anything. Should I really not maintain a "Home" calendar at all, if I want my calendar available to my other devices, kind of like my email is? How would backups work? Right now my TB "profile" is kept on a NAS drive, which is backed up (along with a lot of other profiles) every night.