Thanks for your info, I am having a similar situation here. I'm running my sites on sunOS 5.10, apache2, mysql 4.1.18.
My hosting prover has set up two different php-versions installed simultaniously, each having its own ip, running two apache instances. Now I only need to change to dns ip to shift php version.
My sites are running at 3.6.x and I thought I'd upgrade directly to 3.8.4. But as you can see here: http://ez.no/community/forum/install_configuration/problems_running_updatemultilingual_php I did get som problems running the upgrademultilingual.php script.
Mark, why didtn you go directly go to version 3.8.4? Did you also have trouble with this script?
Mysql version did not change during this upgrade. I am running 4.1.20.
I chose not to go to 3.8.4 for a few reasons.
-There were some questions regarding the reliability of the update in the forums
-The clients were not paying for this upgrade, it was only for my convenience as I was installing 3 new sites on the server this week and did not want to be stuck upgrading even more sites later.
-3.7 is feature equiv, and required no upgrade scripts to be run and a simpler database update -I was doing 10 at one time and wanted to reduce the risk as much as I could
Two different versions running at the same time would have been a nice way to do that, but a little beyond my skills.
All new sites that I install now will start with the latest version, instead of being limited to 3.6.x because of PHP.