RE: [PHP] arguments against moving site from Linux/Apache/PHP server to Windows/IIS/PHP needed

Go with the costs. If you have a running system on apache + php + mysql see how much it costs to support that platform. Meaning how high are the costs to maintain it. Inclusive administration and deployment of apps. Then compare the costs of maintaining a IIS Windows PHP Mysql setup under the same circumstances and than add to that the cost of migrating. Don't forget to compare upgrade costs in apache and IIS. The sums should make it clear. But don't forget to see why they want to migrate. There might be a good reason to do so and you shouldn't be blocking that just because you like linux better. Regards Stefan Langer