What is the newest version of PHP that can be used with Kayako Resolve (v.4)? I can use Zend or IonCube, running on Windows Server 2008, IIS. The Kayako reports apparently only work with PHP 5.3. I tried PHP 5.2.17, and I couldn't get that to work with Zend Optimizer properly. (It worked fine on PHP 5.2.5, but Kayako v. 4 needs at least 5.2.8.) And apparently Kayako doesn't work with ZendGuardLoader, which is required for PHP 5.3. But IonCube should work with PHP 5.3.14, but I've installed this and have IonCube only installed, and Kayako just gives me a blank page when I go to the http://server/setup screen. (I've tried both sets of Kayako install files.) What is the best setup for on Windows server?