Whilst working on a customers site I discovered an issue trying to customize a Windows 2008 Datacenter x64 template, whilst trying to discover if this was an issue with just this OS I have found the following.
The below section is taken from vCenter 4 administration guide
This is the same section from vCenter 4 Update 1 administration guide
Note that Windows 2008 support has been removed from the update 1 administration guide.
I would be interested to know if anyone has been able to customize Windows 2008 VM’s using update 1 and if you have what version of 2008 and was your vCenter a fresh install of update 1 or an upgrade.
@vmwareKB on twitter is currently looking into this for me at the moment, will update you with more findings.
A number of people in the comments and on twitter have told me they have been able to customise 2008 standard and enterprise with update 1, I have reinstalled the VMware tools in my Datacenter template and have now successfully been able to customise my VM. So this looks like a section has just been missed from the documentation. Will let you know when I get an official update from VMware on 2008 customisations.