WP7Forum.ru has got some screenshots of Windows Phone 7 next update, which is named as Windows Tango. There are lots of new updates in this new version and the most welcomed change might be support for lower memory devices. Folks at WP7Forum.ru mentioned that the new update will bring features like managing your SIM contacts, support for lower memory devices (possibly 256MB RAM) and improved MMS. Tango users will allegedly receive a warning in the Windows Phone Marketplace if certain applications require additional memory. Microsoft is expected to unveil Tango at Mobile World Congress later this month.