Ability to switch accounts when in office/home?

I have two accounts set up on my outlook 2k, one is my personal and another one is my work's. This way I can receive email in my laptop from both accounts, without any need to forward one to another. This is also good when I hit 'reply' to an email from either account, and that account's settings will be used, so if it's a work related email, then it will use the work's email as the sender's.

My question is, is there a way to switch the account at the time when I create a new email to send out? As I type this here at work, every time i send an email out, it will use my default email account , which is home, when obviously I'd like to use the work email as the sender. I'm imaginging I can go to 'accounts' and switch the default account, but is there a less permanent solution 'on the fly' as im sending emails?