Microsoft has some history about foldable tablets and the company first intent was with the Courier. It did not go well.
Now Microsoft has presented a patent at the WIPO (World Intellectual Property Organization) with a new concept with different setups like folding handset, tablet mode, tent mode, notebook mode and folded mode.
The Surface handset will run a specially made version of Windows 10 with a custom Windows Shell that adapts depending from the mode, the custom Windows is codenamed as Andromeda.
The device brings also phone capabilities.
The pictures below shows the mechanism for a foldable device.
When this project will see the light is uncertain.