Merging me.com mail with prior Mail account

[repatexpat]

As a work-around for my inability to email out from two other accounts via my iPod Touch (Genius bar couldn't figure it out either) I have just activated mobile.me for use on a long trip. I will forward email from other accounts to me.com and thereby reply directly.

Filing dilemma: When I get back, is there a way to merge the me.com email with my existing Mail account with another ISP or will I have to keep these communications segregated from the rest?

Thanks!
V