6. Microsoft Exchange Server
Key Features: Email, calendars, contacts, tasks that work with MS Outlook. Ability to sync users emails, calendar, contacts with major mobile devices and browsers.
Accomplishments: Emerged as an enterprise champion and is trusted by millions of corporate to manage their emails etc.

Summary: First released in 1993, it has been adopted by the businesses all over the world for its brilliant and central oriented features. It has been the reason behind making Emails, calendars, contacts that work with MS Outlook so popular among corporate.  

5. Windows XP
Key Features: First 64-bit operating system, and made movie’s special effects, 3D animations, engineering and scientific programs possible.
Accomplishments: Even after more than 10 years of its release and several of its successors released, it still remains one of the most popular operating system from Microsoft.

Summary: Released in 2001, Windows XP is still used across various sections let it be domestic or in the office culture. It was the first 64-bit operating system that works with larger amounts of memory.

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