Everything worked fine before the upgrade; after the upgrade /webmail and /sac gave Apache errors "page not found".
/Scalix/rw worked fine.
Problem was that once upon a time someone had removed the symlink /etc/httpd/conf.d/scalix-web-client.conf -> /opt/scalix/global/httpd/scalix-web-client.conf
They copied scalix-web-client.conf from /opt/scalix/global/httpd to /etc/httpd/conf.d so the file was there but it was a regular file, not a symlink. Thus, the installer upgraded the file but the apache configuration in conf.d never recognized the changes, as it was running off of the old copied file.
Hope this saves someone else some headaches. If all the config stuff looks good, start checking your symlinks. Better yet, don't break them in the first place
