Before iCloud became the backbone of the Apple ecosystem, it evolved through three distinct services: iTools, .Mac, and Mobile Me. Apple began its first SaaS effort in 2000, targeting Windows users with free services to lure them into the Mac world.

iTools, launched on January 5, 2000, bundled iCards, iReview, Kid Safe, Home Page, iDisk, and mac.com email. While some, like iReview, were short‑lived, Home Page offered free web templates and iDisk provided 20 MB of free storage with paid upgrades up to 400 MB.

In 2002, iTools became .Mac, adding paid features such as Backup, McAfee, and 10 GB free storage. 2008 saw Apple acquire me.com, rebranding to Mobile Me, which synced email, contacts, and calendars across devices for $99 a year, plus a $149 Family Pack.

At WWDC 2011, Steve Jobs announced iCloud, replacing Mobile Me. Free with iOS 5 and OS X Lion, it automated syncing, introduced Photo Stream, Documents in the Cloud, and Find My iPhone. Over 15 years, iCloud expanded, cementing Apple's SaaS legacy.