Its much better to setup mod_security on the servers with php 4.4.x and let mod_security take care of the bugs with old version of php. Upgrading php on servers even after notification would make problems as last time few customers forced our technical support staff to fix php bugs with their
website hostings.
To convince the customer that he / she has bug in php coding needs fix for the problem to prove. Even if we notify all webmasters to make necessary modifications in their code to make their scripts compatible with php5, they will ask us to provide them with another account where they can test their code with php5.
Conclusion would be that we fix the problem or else some customers will say "somethings wrong with the server"
