Rated 5 out of 5 stars

It is back, and works perfectly with T3.0.3, thanks! We have to use several LDAP servers for our addresses and this makes life so much easier. What some folks might not realize is that once installed, two changes have to be made: 1) Account Settings --> Composition & Addressing --> Customize Directory Server list, and 2) Options --> Composition --> Addressing --> When addressing messages, look for matching entries in.
You have to check all the LDAP servers in both places.

This review is for a previous version of the add-on (1.1.0.001430). 

Hello !
Thanks for your review !
It shouldn't be necessary to define account settings if you don't want specific settings for a particular account.
Selecting the directories in main options ("Options --> Composition --> Addressing") should be enough : they will be available for auto-completion in all your accounts, unless you have explicitly chosen to customize the list for a specific account/identity.