Thunderbird v5, v6...
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Special Features in Thunderbird v3+ (version 3 and greater):
- Imports your email, email mailboxes, email address books including named groups of names-and-addresses from Microsoft Outlook and Microsoft Outlook Express.
- Synchronizes your email, mailboxes, etc. between multiple computing devices including your laptop, tablet, and mobile phone or smart phone.
- (coming soon...)