Microsoft would consider the Linux desktop a version of Office to build. This version would be next year on the open-source operating system is due to be released. Moreover, it would go to a native port of Microsoft’s office suite.
Internally, would there may already be code written for Office on Linux to get it. This would be a native port and not an emulation, for example via Wine-version or CrossOver. It is unclear how far this version has been developed. The source would still have said that a possible release in 2014 would need to take place.
Despite the fact that Office for a long time a Windows – and OS X-only product, Microsoft is due to increased competition forced the recent years, the office productivity suite on more platforms, including a web version. Also, there will soon be a version for iOS and a version for Android. The latter operating system is running on top of a Linux kernel.