I have few windows production servers which are still in windows server 2003 version. Currently we are planning a total revamp to windows server 2016 existing windows environment.
My question is if I reinstall the OS 2003 into 2016 on the same physical hardware, should I able to use the registered license key for 2003 into latest 2016 for activation.
No, this is not possible.
I'm also not sure if hardware that was suitable for Win 2003 is suitable for 2016+ :)
Quadrotech - Management, Reporting and Migration for Office 365 and Exchange
No, a Server 2003 key can only active a Server 2003 install. The minimum hardware requirements are
I'd also check here and with server manufacturer about support for Server 2016