I have a friend who is having two different email accounts.

However, I want to be able to select how to reply to the account so account 1, account 2

Email that come in from account1 - needs to be replied through account1 I'm currently telling he use outlook for account1 - which is the old one and uses outlook express for account 2 - which is a latest one.

With my current setup all replies go through the default account. Which is not my concern here, but I just want a simple way to do it.