I have a server that has 2008R2 w/Hyper-V. I have created a Virtual server with Exchange 2010 and have made the size of the .vhd around 400GB. I have only used around 20GB. When i check the virtual drive in Hyper-V it shows as a 'fixed' drive. There are wizards to expand the size of the .vhd so it seems simple....however....i've read online that many people have had problems with this. Is this the case? I have about 10 exchange users that i have moved into this exchange virtual server so i don't want to lose their data after i expand this .vhd. Any suggestions? Am i too worried and just do it? I've heard that i would diskpart as well...is that necessary? Thanks again!