Hi All, I have two separate installations with this same problem - It seems that when I create a virtual Exchange Server installation with two separate (VHD) drives attached the virtual machine slows down to a crawl, takes about 10 minutes to boot, and another 10 minutes before it enables the network card and begins serving clients. In both cases I am using Hyper-V R2 on Dell servers. RAM and CPU is not a limitation. I have tried with a shared NIC, a dedicated NIC and a team NIC. In both cases I am using a NetApp SAN on the back end with both VHDs on the same LUN. The NetApp gets a performance/drive usage boost when you create an aggregate with all drives and biuld your LUNs on that aggregate. The Guest OS/ Exchange combo is 2008 with all patches and Exchange 2007 with all SPs. The other install is using server 2008 R2 with Exchange 2010. Anyone seen this before? Shaun

Hi It seems to be Hyper-V problem. You can post it on Hyper-V forum http://social.technet.microsoft.com/Forums/en-us/winserverhyperv/threads