Re: Micros~1
It's not usually pronounced. It's been a print-only visual jargon pun for just over 25 years.
(I first saw it on Usenet back when Win95 was still in Beta. Sadly, I can't remember who came up with it, and sadly the gookids have buggered up the irreplaceable DejaNews archive, so whoever it was has probably been lost to history. It is possible that it was a collective "ah-hah!" moment invented by several people nearly simultaneously.)