Day 1 of Mobile World Congress has been the occasion for Microsoft to introduce officially the Windows Phone Tango, or Windows Phone 7.1.1

A CTP of the 7.1.1 SDK is now available. This CTP does NOT comes with a go-live license, it basically means you will NOT be able to publish apps to the marketplace with it.

“The Windows Phone SDK 7.1.1 Update provides additional functionality to the existing Windows Phone SDK 7.1 software to enable mobile developers to better target applications for 256MB Windows Phone devices. This update includes an updated 512MB emulator, as well as a new 256MB emulator image, and Intellisense support to communicate device targeting preferences. Once installed, the WP SDK 7.1.1 update allows you to decide which emulator you would like to deploy your app to.”

It is important to note that generic background agents will NOT be available on devices will only 256MB of memory… Read the What’s new in Windows Phone SDK 7.1.1 for more details. At this point it does not look like Microsoft has communicate any other details related to the OS itself (new features or bug fixes…).

As I said in my last post, the next big step now is Windows 8 Consumer Preview on wednesday…

Oh, and by the way, I case you missed it, Skype for Windows Phone 7 is now available in beta. Here is the QR code: