[CentOS] Virtualising legacy CentOS 4.x servers

Dear all,

I look after a number of CentOS 4.x servers running legacy 
applications that depend on ancient versions of various things (such 
as MySQL 3.x) and which can't be upgraded without non-trivial 
development effort.

I've been considering virtualising them and as a test have been 
trialling with a company that uses Parallels Cloud Server 6.

However, I've run into a roadblock in that the Parallels Tools 
installer in PCS6 require a version of glibc higher than that which 
is available in CentOS 4.x (v2.5 required versus v2.3.4 installed).

Without the guest OS tools installed it's impossible to migrate a VM 
from node to node or back it up without shutting the VM down first, 
which is less than useful.

So I have two questions:

1) Does anyone know if there is a version of the PCS6 Tools built 
against glibc 2.3.4 available anywhere?

2) Is there an alternative virtualisation environment I should be 
looking at which fully supports CentOS 4.x as a guest OS? And if so, 
does anyone have recommendations for a hosting supplier that offers 
that environment (ideally UK based).

Many thanks
Simon