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Air Drop is one of the best demonstrations of Apple's "it just works" approach: from OS X 10.7 and i OS 7 onwards, you could Air Drop photos or files from one device to another with a single tap.

Air Dropping between i OS and OS X wasn't possible until OS X 10.10 Yosemite, and it's only available on devices with both Wi-Fi and Bluetooth LE, although Mac to Mac Air Dropping is supported on Macs going back to 2008. Instant file previews at the tap of a space bar might not sound like a big deal, but when those previews are of anything - of documents and images, of movies and music - it's a massive time saver, especially when you're trying to find an audio clip, video or image.

It looked and felt amazing: a quantum leap from the ageing Mac OS, and in a different league from Windows 95.

Operating systems were fifty shades of grey, and not in a sexy way. It wasn't a surprise - OS X 10.0 had been unveiled at Mac World Expo in 2000 - but consumers could actually get their hands on it in 2001 for the princely sum of $129.

It indexed your entire system to enable lightning-fast searches, and it became better still in OS X 10.5 when Quick Look instant previews, a calculator and a dictionary were added.

Spotlight was significantly enhanced in OS X 10.10 Yosemite, and we use it as an app launcher, Maps searcher and Wikipedia interrogator. OS X 10.5 Leopard introduced Time Machine, which addressed an age-old problem: how do you persuade people to make regular backups of their data? Time Machine takes snapshots of your system, enabling you to travel back in time to recover individual documents or items such as Calendar entries and doing so in a very simple and attractive way.

Quick Look first appeared in OS X 10.5 Leopard, although it didn't get support for animated GIFs until OS X 10.7.

We've left the most valuable OS features until last.

With more and more Mac users owning i Phones and i Pads too, Apple decided to make them work together with OS X - and it did that with a feature called Handoff, introduced in Yosemite.

Handoff enables your Mac to take phone calls and messages from your phone, open documents you've been working on in i OS, and switch on and connect to the i Phone's Personal Hotspot.

The move wasn't as odd as you might think, because it gave Windows users yet another reason to switch to the Mac: you could run bespoke business apps and demanding games natively instead of inside an emulator.