Using perl does not imply supporting it. Even so, perl isn't a threat to MS, nor would I want it to be. It's Just Another Language which they may or may not support in their products in the future just like they've supported C, BASIC, Java, Fortran, COBOL and perl (yes, perl) in the past. And unlike (eg) Java it isn't encumbered with a litigious MS-hating corporation or a restrictive licence.
Contrary to popular geek mythology, people working for MS are not stupid. Some of them may be ... ethically challenged, but stupid they ain't. And intelligent knowledgeable people like to use the best tools available for their job, which sometimes means using perl. And intelligent managers say to their intelligent peons^Wemployees "OK, you can use perl, because it will mean you do more work and make Bill more millions".
Note to self: stop replying to trolls.