Comment 7 for bug 507089

If you read my previous comment, you'll see that a possible workaround for this bug right now is to go into /usr/thunderbird and:
    mv libldap50.so moved-libldap50.so
    ln -s /usr/lib/libldap-2.2.so.7 libldap50.so
Of course, change the locations of Thunderbird and your currently
installed /usr/lib/libldapXXX as required for your distro/version.
Then, restart Thunderbird.