Is Windows 2008 R2 64bit supported on ESX 3.5 U4?
no, only in vSphere4 U1
Windows 7 and Windows 2008 R2 support –This release adds support for 32-bit and 64-bit versions of Windows 7 as well as 64-bit Windows 2008 R2 as guest OS platforms. In addition, the vSphere Client is now supported and can be installed on a Windows 7 platform. For a complete list of supported guest operating systems with this release, see the VMware Compatibility Guide.
http://www.vmware.com/support/vsphere4/doc/vsp_esx40_u1_rel_notes.html
Where can I find a list of guest operating systems supported on 3.5?
Actually, it's supported as of ESX 3.5 U5.
Regards
JD
CompTIA A+ Network+
vmware VCP 3