I am running PHP 5.1, Apache 2.059, MySQL 5.1, SquirrelMail 1.4.10a. I have tried and tried to get vlogin to work!! I used to have a 1.4.09a version of SquirrelMail that worked, but the server was starting to get a little flaky. So, I created a new mail server and moved everything over. Now, with the new version of SquirrelMail, vlogin causes it to hang on logout. I had to convert to an older version of vlogin (version 3.6) from version 3.9.2-1.2.7. Now it works.