[jessaustin]

Other languages might have special rules regarding proper nouns and their use as verbs, but English doesn't. Basically, we follow the normal rules for words, except in cases where that would cause a problem. In this case, following the normal rules prevents a problem.

Incidentally, I would suggest "Microsoftened", since "soften" is already a verb that everyone is comfortable using. "Facebooked", of course, was a normal word in common use before anyone ever heard of Zuckerberg. Two vowels followed by a consonant is simply a different situation than one vowel followed by a consonant.