After upgrading to 1.8.0 earlier this morning every web site on my server was rendered useless. This isn’t good and repairing everyone’s web site isn’t exactly the easiest thing to do.
I want to go back to 1.7.x ASAP.
It might be a simple fix (like squailto’s php.ini change) but at this point I’m mobile and SSH’ing into my server isn’t exactly possible.
The phpBB installations I could find are now working, and the login page for your Squirrelmail seems to work, although I of course don’t have any login to test it with.
Let us know if you find any other specific problems.