Today Microsoft has announced that the final work on Windows 8.1 has been now completed and just after several hours of this official announcement, the final build of Windows 8.1 updates has been leaked on Internet. Microsoft is set to release the final copy of Windows 8.1 Update this October, but it seems like now several online sharing websites are already having copies of Windows 8.1.
The final Windows 8.1 RTM version also include a built-in Skype application, which replaces the default messaging client. Currently the leaked version of Windows 8.1 RTM is a localized Chinese version, but English version are also being prepared. Microsoft will officially launch Windows 8.1 on Windows Store on October 18th.