Officially, there is no current version of VirtualCenter 2.x that can manage Server 2.0 hosts. This is mainly because Server 2.0 is still in Beta, QA coverage has been limited, there is no documentation to support you and you will not be able to open up a VC SR with support, etc. However, as a PROOF OF CONCEPT ONLY (non-production, see caveats above), you should be able to add Server 2.0 Beta 2 host(s) to VC 2.5. When adding the Server 2.0 Beta 2 hosts, make sure that you use <ip_address>:<tcp_port_number>. Until we get the final GA version of Server 2.0 out, we will be unable to lock down a VC release that will officially support Server 2.0.
what about Virtual Center 1.4.1 for VMWare Server? We have bought Virtual Center 1.4 to manage our VMware Server, but I cannot connect the 2.0 one.
What is the plan here?
Not compatible since the underlying kernel for Server 2 (more ESX like) is different than Server 1 (more GSX like). You can only manage Server 1.0.x hosts with VC for VMware Server