Does anyone know of detailed tutorial on how to do this?
Thanks
I don’t use IIS 6 anymore, but it’s easy on IIS 7 You just install the new version and configure you website to run on the new version and you can leave the old version in place and switch back to them if needed.
Here’s an old article that might be of use for IIS 6
http://blogs.iis.net/donraman/archive/2009/10/08/upgrading-to-php-5-3-an-easy-way.aspx