Yeah, I didn't even realize that until you said it. Whenever I see an iThing, I assume it's something Apple. The power of branding.
http://en.wikipedia.org/wiki/Internet_Message_Access_Protoco...
I would probably had seen IMAP thousands of times. iMap is the first time and has a very similar shape to iMac that is very known for me as I had several of those.
I don't really know why he starts with lowerCase, them Upper case in the middle, then lower again.