by David Aylmer.
That's exactly right, Luis...
There are a bunch of issues regarding sqlsrv on the tracker. I was also concerned by a recent post to this forum here: https://moodle.org/mod/forum/discuss.php?d=232254
"I did not use FreeTDS. Therefore, I advise not to use it either, and to skip or disregard any step related to its use."
I hope no one takes that advice on a production server!
I was able to build FreeTDS pretty quickly... but building PHP 5.5 source (with includes for FreeTDS) has proved a stumbling block for the minute.
My fallback is to use PHP 5.4 and wincache.