Can't create lowercase mu

[Nancy Allison]

Weirdest problem EVAH.

I cannot create a lowercase mu (can't do it in this email neithah, but 
that's because verizon webmail doesn't provide symbol font).

I've tried it two ways: Numlock + ALT + 0109 and apply Symbol font. Or, 
type lowercase m and apply symbol font.

In both cases, I get the capital mu, not the lc one.

I've done it successfully lots of other times. What's happening now?