This is a genuine Microsoft MS-DOS 6.22 Plus Enhanced Tools Operating System for sale. It comes with an original Certificate of Authenticity and is brand new. This software is compatible with Microsoft DOS operating systems and is a great addition to any collection. The brand is Microsoft and the model is MS-DOS 6.22 Plus. This item falls under the Computers/Tablets & Networking, Software, and Operating Systems categories. Don't miss out on the chance to add this piece of history to your collection. This is definitely a collectable item and the way it's wrapped provides a perfect view of the certificate of authenticity hologram. Not many of these are this aestheticly pleasing. Original sealed packaging and in perfect condition.