The down votes are, if I had to guess, due to the use of M$ as a "clever" euphemism for Microsoft.
M$ = Microsoft isn't seen as the best. Here is conversation on Stack Overflow. http://meta.stackexchange.com/questions/6185/is-m-for-micros... Guess the days of referring a negative point of view towards Microsoft or a Microsoft IT Department isn't accepted anymore by using communicating this by M$.
I blame the stupid text message - script kiddie leet speech that came afterwards destroying this practice.