Office 2010 officially went on sale yesterday, so here?s a recap on what?s new in the suite and more.

New Stuff: There have been a number of changes to the UI, applications and also support for x64. The ?Ribbon? has been introduced to all applications which gives users a consistent interface at the top of the screen. It can be customised to allow easy access of key tools and features, to get your suite looking just the way you want it.

64-bit support: Microsoft has made office 2010 available in a x64-edition, which is a first for the suite. It will only run on x64 bit Vista or Windows 7 machines and will take full advantage of your processors speed. Application will launch faster and users will be able to work with larger amounts of data.

Editions: There are as always different versions for you to choose from. Beginning with Starter Edition, which is free, but only offers basic support in Word and Excel and contains advertisements. Finishing with a Professional Plus edition which gives you everything it?s got bar Visio and project 2010.

Upgradeable: Office 2010 can be upgraded at any-time from a limited version to the Pro Plus one. The Home + Student edition will upgrade to Home + business from within Office 2010.

Web Apps: You can now collaborate with friends over the internet, and they don?t even need to have the application themselves. Sharing documents with friends enables them to help with editing on the fly. Web Apps allows you to share any document from the suite so that family or friends can help you out.

Mobile Office 2010: Released concurrently with Office 2010, the mobile suite has been made for Windows Mobile 6.5. A different version will ship with WP7 later in the year.

Mac Edition (Office 2011): Microsoft have promised a full version of Outlook in the Mac 2011 version, this will include .PST file importing, Time Machine and Spotlight support. Office Mac will only be available in a 32-bit version.

You can get a look at it in action here.