I've just installed PHP 5.0.4 into a c:\php folder on the server but plesk is having some problems. for example it cannot detect php service installed.
Download the PHP 5.0.1 zip package, copy all the files in this package to SWsoft/Plesk/PHP and paste all the files..
after that go to START--> RUN and write there
websvrmng --reconfigure -all
Yesterday we had lots of problems with domains that stopped working and the only way we where able to fix this was to set a separate application pool for each domain.
I have little or no knowledge at all about plesk and I'm a little bit scared to mess with it and loose all the accounts that the company has here.
P.S. Webmail still doesn't work and I don't know how to fix it.