Owners of the Nokia Lumia 800 have reasons to celebrate as the Windows 7.8 update is now available for download via the Zune desktop software.

The update comes in four parts, first a Nokia update for Windows Phone which comes in the form of 7.10.8773 to 7.10.8779.8, then 7.10.8783, and finally to 7.10.8858.136. After upgrading your Lumia 800 device, users should experience an all new start screen with customizable tiles along with a host of other features both from Microsoft and Nokia.

Per reports, it is not yet known when the update will be available for other Lumia models or when it will come to other branded Windows Phone 7 devices. It appears that non-Lumia owners may have to wait until early 2013 to get Windows Phone 7.8, or if they are feeling adventurous they could flash their devices with the latest ROM.

Core features:

• New start screen
• New live tiles
• Bing lock screen
• Pocket and child proof lock screen security
• 20 new accent colors

Nokia Lumia exclusive features:

• Bluetooth Share (for DRM free media files)
• Cinemagraph add-on to create blend and photo and movie-like animation, creating photos that are alive
• New camera lenses to remove unwanted objects in your photos such as passers-by or people on the edge of the shot the spoil the photo.
• Updated Contacts Transfer application
• Updates Contact Share application
• Ringtone Maker application
• Fire up the Zune desktop application to get the update