Go to Account Settings
In Mozilla Thunderbird. Click on Tools → Account Settings
Click on Composition & Addressing
Under Account Settings, select your email account that you want to add EDIR to, and then select the section labeled Composition & Addressing
Select Use a different LDAP server:
Under the Addressing section, select Use a different LDAP server: and then click on Edit Directories...
Click the Add button to add a new LDAP server.
Fill in the Server Information
Fill in the following information
Base DN: ou=people,dc=Alaska,dc=edu
and then click OK and then click OK again to leave the LDAP Directory Servers window
Select your New Address Book!
Back under the Addressing section, select your newly added EDIR account from the drop down list. and then click OK
Congratulations your Thunderbird Email client is now configured to use EDIR as an address book.
Open the Address Book
Click on Address Book or press Ctrl + Shift + B to open the Address Book.
Select EDIR from the Address Books on the left, and then search it using the bar in the top right
NOTE: The name of the Address Book will be what ever you entered under step 5