I'm running Plesk with IIS 7.5. Plesk doesn't support anything over 5.3 for PHP so I had to add it via the handler mappings which was working perfectly.
The websites went down this morning literally as I was working on them so I thought it was me. After hours of debugging, I've just noticed that the PHP version in the IIS handler mappings section has reverted back to the default (PHP5). There's only me with access to the server.
I really haven't got a clue how it happened or what steps I need to take to prevent this happening again.
As it stands, I've suspended the 2 domains I have running 5.8 while I get this issue sorted. I'm really not sure what to do as I know Plesk won't help as they don't support 5.5.8.