To set up email as an IMAP Email Account on your Mac Thunderbird client, just follow the four basic steps below.

Step 1: Select "Add Mail Account" if you're not being prompted by the New Account wizard upon installation.

When you open Thunderbird first time, a New Account wizard might appear to guide you through installing a new account.

If the New Account wizard does not appear, you can access the wizard by going to Tools - Account Settings on the Thunderbird menu bar, and in the Account Options located in the lower left corner of the window the Add Mail Account.

Step 2: Enter Basic Account Information.

A popup with your basic information will appear.  Enter your full name into the Your Name field, your workspace email address into the Email Address field, and your workspace password in the Password field, then click Continue.

Step 3: Enter IMAP Server Settings.

In general, Thunderbird will fail try to automatically find the needed server settings and will prompt you to to manually enter them.

Use the following server settings.

• Username: your full email address (e.g., jsmith@company.com)
• Incoming: imap.odmailbox.com, select IMAP from the drop-down menu, and enter 143 in the field next to it and select "STARTTLS" in the drop-down to its right.
• Outgoing: mail.odmailbox.com, and enter 587 in the SMTP port field and select "STARTTLS" in the drop-down to its right.
• Click Re-test Configuration above the first None.

Step 4: Make sure that you have selected the proper SMTP server settings to send email.

After Thunderbird successfully retests the new settings, click Create Account.  You will see the Account Options window again. Click on Outgoing Server (SMTP).  Make sure your new settings are selected as default.

Click OK to close the window.