You really have 'Micro$oft' on your 'resumé'? That's so childish...
It keeps 'serious' companies from contacting me, improving my accuracy on finding a position I can handle without headaches.
It's possible you would be ok working with others of this mindset, but I think you're better off w/out it.
No ad-homs intended, just wouldn't want you to miss opportunities with companies that frown upon being close-minded (but are still non-microsoft).
It's also possible I am still.
But you both make a valid point on it being perceived as immature, and so I will note it for the next time I use this.
Thanks for the suggestion.
If the company I am applying to bases their solutions on Microsoft products, odds are I am not the right fit for their open position, and somewhere on HR or in my task to find a job there has been an error.