.Mac, is a subscription service that Apple offers. It is available for both Windows and Mac OSX but offers more functionality for OSX. Its features include:
• Email: The address for your email is  username@mac.com , where username is your .Mac login name. You may access your email from any POP or IMAP client or from: http://webmail.mac.com/
• iDisk: This is a set amount of file space that you can mount on your desktop like any other network volume. You may then access this file space from any computer running Mac OS X or Windows XP that has internet connectivity.
• Groups: for your groups interconnectivity and communication
• Gallery: To link between iphoto and your online gallery automatically
For information about other services, see:
http://www.mac.com/

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