Microsofter

noun2

1. •
   An employee of Microsoft.

   • A Microsofter revealed the real reason for the party to a reporter: “We were trying to figure out how to get our name out there even if we weren’t at the Faire[…]” — 1984
2. •
   (informal) A supporter or user of Microsoft products.

   • Upside down posters are virtually always Microsofters and/or newbies. Try not to tar yourself. — 2000