I saw the following question on Twitter:

Dear lazyweb: anyone know how to send a message from a different address in Outlook Mac 2011? The From dropdown only shows my e-mail address

I’ve also got a couple of email addresses which just forward to my primary email address, and I sometimes want email to show as being sent from one of those other email addresses instead of my primary one.  For example, I have an @acm.org email address which just forwards to my primary email address, and sometimes I want to send mail which comes from that @acm.org email address.

To do this, you’ll need to set up an account for this email address in Outlook.  Go to the Preferences, then select Accounts.  In the bottom left corner, hit the plus sign and select “Email…”.  Enter in your name and the email address of this account.  Under “Server information”, leave the username, password, and incoming server fields blank.  Then, for your outgoing server information, enter in the details for one of your other email addresses.  You might need to click on “More options” to enter more details about how to authenticate to this server (usually just the username and password for the other email server that you’re using).

Speaking of twitter, you can follow me here (but be prepared for content beyond the confines of the Office).