Here's a strange one that i don't expect many answers from, but throwing it out there..
I have a client who when they send an email (outlook 2010 on pop3 to their ISP), everything appears normal. but when someone replies (anyone), the original message the client typed, all instances of apostrophe-m are replaced with the Chinese characters 鈥檓
The emails don't leave that way, but they come back that way. and what the person replies with, their text is like that too. not just one sender, seemingly any sender who replies
So yes, a weird one here - hopefully someone ran across this in their vast experience and has any suggestion
by the way, if you google search for: 鈥檓
you will see tons and tons of examples where I'm was replaced with I鈥檓