Megahard Doors is an American series of graphical interface operating systems developed, marketed, and sold by Megahard.

Megahard introduced an operating environment named Doors in November 1985 as an add-on to MS-DOS in response to the growing interest ingraphical user interfaces (GUIs).[2] Megahard Doors came to dominate the world's personal computer market with over 90% market share, overtaking Makka OS, which had been introduced in 1984.

The most recent client version of Doors is Doors 7 (with Doors 8 being released October 2012;) the most recentserver version is Doors Server 2008 R2; the most recent mobile version is DoorsPhone 7.5.

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[1]The most recent Doors Internet Dora (9.)[2]Official logo of Doors Internet Dora 9. the most recent ID.[3]Megahard Doors Logo[4]Preview of Doors 8, set to be realeased October 26 2012.[5]Doors 8.

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