MobileMe

 MobileMe, previously iTools and .mac, was a service provided by Apple Inc. It included web-based email, a website, iDisk, an address book and bookmarks that were accessible over the Internet, iCards and other services. The price was $99. MobileMe was replaced in 2011 by iCloud.

History
The original incarnation of MobileMe at its conception as iTools was an offer of free mac.com email addresses from Apple, which could be configured to forward your normal email address. The appeal of a free email address which was easy to remember and, in addition, showed where one's loyalties lay, was clear.

In a separate development, Apple released iDisk, which was also free and allowed any Mac user to access a remote drive that acted exactly like a drive mounted locally on their Macintosh. It was restricted in size, and the availability of paid-for upgrades soon arrived, but for a long time remained a free and useful source of both backup space and software downloads, which were available from a separate read-only folder on every iDisk.

Eventually, in what some perceive as a swipe at Microsoft's much trumpeted .Net, Apple announced the release of .Mac, and suddenly all of the mac.com email addresses were set to expire unless the users paid to join .Mac. There were the inevitable complaints from Mac users who were now to be charged for something which they (mistakenly as it turned out) believed had been told would be free for life, but the addition of Norton, Anti-Virus and Apple's own Backup software, along with several other new features, to the existing email domain and iDisks encouraged many users that it was worth the money.

Replacement
MobileMe superseded .Mac with the release of the iPhone 3G and iPhone OS 2 in 2008. However, MobileMe's launch was plagued with problems and was eventually replaced in 2011 by iCloud.

Articles

 * How-To Replace MobileMe Features That Apple Discontinued In iCloud by Ryan Faas at Cult of Mac (2012-06-05)