Generally speaking, (using older stuff here), that should only happen
when you compose a new message.
You will send with the account assigned as the default account.
I've never found a way around that.

When you reply, it will reply with the same account that received
the message.

                                  Rick Glazier

From: "Russ"
>I have just started using Outlook 2007.  Is there a way to keep the address
> book and the from account together automatically?  I have multiple accounts,
> and have to separately pick the address book to use and the "account from"
> for whichever account I'm using. So I often send email from the wrong
> account. It confuses the recipient - and me. 

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