I've searched the forums and have not found an answer to this question:

If I use Unite! will it sync my IMAP folders?

I'm currently on BIS and the one big thing I wish it would do for email is give me access to these folders. I have at least 3 computers set up with my email accounts and it sucks to not have my BB in sync.

No it won't sync. It will fetch new mail but that seems to be it.