Microsoft recently updated its website to provide more information about the company’s upcoming “Tango” Windows Phone operating system. The small update will bump the build number up to 7.10.8773.98 and will update the messaging app, allowing users to attach multiple files to a single message. Tango will also allow users to import contacts from the SIM card and include “other improvements.” The new version of the Windows Phone operating system is already shipping on the European version of the Nokia Lumia 900, however it is unclear when it will be made available to other Windows Phone handsets and carrier-branded devices.