I was facing a lot of issues doing LDAP lookups on my company’s LDAP server. The searches were happening but they were very very slow, so most of the times while replying to an e-mail and selecting addresses, the Thunderbird application just hung.
I am using Ubuntu 7.10 with Thunderbird 126.96.36.199 in my office which has an Active Directory Setup. The comment as posted on http://www.linux.com/articles/114010 with the comment permalink being http://www.linux.com/?module=comments&func=display&cid=1147932
The solution for me was, just using Port 3268 instead of Port 389 which is common for LDAP. I am a happy man now 🙂