Upgrading PHP on Windows IIS

[ahmedtheking]

I've currently got PHP Version 5.1.2 installed on a Windows IIS via CGI. The server also serves ASP.NET apps. What are the implications of me upgrading PHP to 5.2? What will happen to the old installation and what's the best way to roll back if it hits the fan?

[eelixduppy]

How'd your upgrading go if you made it that far? The installation of 5.1.2 will be removed if you are just replacing files, but you could keep backups of these files in their current locations in order to rollback if you need to.

[ahmedtheking]

I'm still postponing it 'til I can find a full-proof way. I don't want it to take the PHP sites down nor do I want it to mess up IIS or any ASP.NET Pools