4. MS DOS
Key Features: It was released as the primary operating system in IBM PCs in the 80’s and mid 90’s until replaced by GUI operating systems.
Accomplishments: Adopted by IBM as its primary operating system. It was the most popular operating system in use before the Windows came into existence.

Summary: MS DOS has a series of controversies attached with its release. It was developed by Microsoft on IBM’s request which some say has only the ‘touch’ of Microsoft and is more or less Seattle’s Computer Product’s QDOS. Also, it was developed alongside PC-DOS but later captured its market share ruthlessly.

3. Microsoft Office
Key Features: Excellent productivity application, easy-to-use, scalable features.
Accomplishments: It has been the most revolutionary products from Microsoft that redefined the office environment. Many a people have got so used to it that it any attempts to tamper with the product will create havoc.

Summary: Among the most used software, MS Office had been more than successful in stamping Microsoft’s dominance in the enterprise environment. It is used worldwide and with its applications like MS Word, MS PowerPoint, MS Excel, it has become synonymous to word documents, presentations, and spreadsheets.

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