Hi @TTadmin ,
Unfortunately all Windows Server versions that came out after Windows Server 2008 R2 are only available in 64-Bit, which means that you cannot upgrade your existing Windows Server 2003 SP2 32-Bit operating systems to Windows Server 2016/2019.
The recommended approach is to install new servers and migrate everything from the old servers to the new servers.
There are many articles that describe how to migrate Active Directory (AD) from Windows Server 2003 to newer operating systems, here's a few:
- Step by step Migrate Active Directory Windows Server 2003 to Active Directory Windows Server 2016.
- Migration From Windows 2003 AD To 2016
Here's also an old TechNet forum thread about a similar query:
Server 2003 to 2019, alternative way to migrate users and shares?
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Best regards,
Leon