In reply to mike123:
I feel your pain, I wanted to have two email accounts on the same app, and started using the mail app on windows. Its very unfriendly, poor at searching, and only stores part of it on the computer, the rest you need to hunt for online which never seemed to work.
So I went to Outlook, which despite its faults seems to work ok, and I'm familiar with it as I use it at work. Only thing I haven't sorted is I still get notifications from the old email set up...