Version 10.10.3 introduced the ability to use external 4K displays at 60Hz (only certain models support this) and the Photos app which has replaced iPhoto.

Introduced Handoff which allows answering calls from an iPhone on your computer (only certain models of computers and iPhones support this, click here for more info).

Introduced Mail Markups which allows doing minor edits to attached images in Mail.

Introduced MailDrop which allows attachments up to 5GB to be sent via email.

Added the ability to organize files and folders with Tags.

It was the first free version of OS X and also the first to discontinue the cat-naming scheme of previous versions.

Introduced Notifications, documents in iCloud, Gatekeeper, AirPlay mirroring, and Reminders/Notes apps.

First version of OS X to be fully 64bit.

*iTunes 12.2.2 is the latest version for Lion and doesn’t officially support iOS 9 but does work

App Store code to download can be purchased here.

Apps that support it can use new Full Screen mode.

The ability to run PPC software is completely gone.

Last version of OS X to support Intel machines with 32bit EFI.

First version of OS X to be download only through the App Store and isn’t available on a disc.

*iTunes 11.4 is the latest version for Snow Leopard and is not compatible with iOS 9

A DVD of Snow Leopard 10.6.3 can be purchased here.

Introduced the App Store which allows further OS X upgrades.

Has Rosetta which allows older software written for PPC to run on Intel.Snow Leopard was the first version of OS X to only support Intel processors and was the first to be 64bit.*iTunes 10.6.3 is the latest version for Leopard and is not compatible with iOS 8 or higher The ability to use OS 9 programs with Classic has been removed.Leopard was the last version of OS X to run on PPC hardware.*iTunes 9.2.1 is the latest version for Tiger and is not compatible with iOS 4.2 or higher PPC hardware running Tiger is also able to run older OS 9 software using Classic.Tiger was the first version of OS X to run on Intel processors.Before upgrading any Macintosh, iPad, or iPhone, we recommend talking to a PowerMax representative to ensure your entire system operates the way you want it to. The following article is a synopsis of each major OS X version since OS X 10.4 Tiger.

Our used Macs often come with previous versions of Mac OS X, and our customers sometimes would like to know what the differences are between different versions.

Mac os x versions