Quick blog to respond to several queries which have been directed at me today which needs a little clarification - this is with respect to the number of companies who have licensed the VHD (Virtual Hard Disk) file format now increased to more than 45.
Many people implied that this was a "new" announcment today (ie we hadn't been licensing the VHD format previously). The royalty free licensing of the VHD format actually went live last year. Today's inclusion of comments regarding VHD licensing as part of the press release was to give a better understanding of the level and examples of who was using the specification since we last provided public details.
To sign up for the VHD licensing programme, see this page on microsoft.com