If you don't have Thunderbird setup for e-mail already and it detects another e-mail program, it will ask about importing information from the other program. If you already have your CMS e-mail setup under the other program, you can import this information and save your some steps. If you don't import, and are starting the program for the first time, it will take you to the Account Wizard. If you have a different account already setup in Thunderbird, open the program and click on the "Tools" menu and select "Account Settings" then click the [Add Account...] button.
Click on "Email account" and select [Next >] to begin setting up the account.
An Identity window will appear. Type in your name e-mail address and password then click "Continue".
Thunderbird will now try to autodetect your server settings. Manually override this by clicking "Manual config".
Now fill in the blanks according to the following template, of coarse substituting your name and e-mail address in the appropriate boxes.
Finally click on Create Account.
After the account is created, the Account Server Settings window should look like this:
And the Outgoing Account Settings window would look like this: