.Mac.Mac refers to a group of online services offered by Apple Computer, using WebDAV technology. These include website hosting, web-based email, iDisk remote storage, virus scanning software, backup software and other "specials" offered by Apple to subscribers.
Apple previously offered a similar free service which they called iTools, ending when .Mac debuted. Mac users had varied responses to this move. Critics called the .Mac service overpriced and did not appreciate that subscribers of iTools who did not subscribe to .Mac lost their @mac.com email address. Advocates cited TANSTAAFL and the arguably improved services.