
To do this, make sure Entourage isn’t running on either computer. However, if you’re sure that one copy of Entourage is a superset of the other (so you won’t lose any messages by overwriting the other one), you can sync one Mac’s copy of the Entourage database to the other Mac. Therefore, your best bet by far is to switch to IMAP or another server-based account, so that syncing becomes automatic. If the two have different sets of messages before you start, you’ll lose data. With Entourage, your only option is to entirely overwrite one computer’s copy of the database with the other’s copy. Before switching to the copy running on your other Mac, use your synchronization utility to resync the Mail folders.

From now on, be sure you run only one copy of Mail at a time.

Launch Mail and allow it to reimport your messages (which means it’s really rebuilding your message database).
MAC MAIL EXCHANGE SYNC PERIOD MAC
(This synchronizes everything, including On My Mac mailboxes, rules, and junk-mail statistics.) Then-only after the first time you do this-navigate to that Mail folder in the Finder on each Mac and drag the Envelope Index file to the Trash.

Using your favorite sync utility, synchronize the entire Mail folder ( your user folder/Library/Mail) bidirectionally between your two Macs. To sync Mail messages, first make sure Mail isn’t running on either computer. All is not lost, though you just have to be very careful in how you proceed. So once again, while you can synchronize that file between Macs, you can’t synchronize individual parts of it-if you’ve received messages on both computers since your last sync, there’s no way to merge the two databases. Entourage, meanwhile, stores all your e-mail data in one huge database file. You can synchronize two folders with different sets of messages easily enough, but if you try to synchronize the database files, one will entirely overwrite the other, so Mail’s message lists will be incorrect. Mail stores all your messages as individual files, but it also relies on a database to store an index of your messages for faster display and searching. However, both Mail and Entourage throw wrenches into the works. You can, of course, simply copy all the files that pertain to your e-mail from one Mac to another. Local E-mail Messages If you’re stuck with a provider (say, your employer) that provides only POP-based access to your e-mail, or if despite having an IMAP account you’ve stored some of your messages locally on your Mac, you’ll have to turn to file-based synchronization. Another option, available to everyone, is to get a free, IMAP-capable Google Gmail account. Your existing e-mail provider may already offer IMAP access to your mail ( has more advice on using IMAP, including switching from POP). You can configure your e-mail program to keep local copies of all your messages, too, so that you can read and search them even when you’re offline. With these accounts, all your incoming, saved, and sent mail is stored on a mail server. Server-Based Accounts The easy way, which works with almost any e-mail client, is to not sync your e-mail at all, and to instead use a server-based account (.Mac/MobileMe, IMAP, or Exchange). If you want to make sure you have exactly the same e-mail messages-including all your saved and sent mail-on two or more Macs, there’s an easy way and a hard way to do so.
