Microsoft published additional technical solution papers:

• Two Sites, 20,000 mailboxes
  Virtualized solution running Hyper-V on Dell R910 Servers, EMC CLARiiON Storage, and Brocade Network Solutions
• Two sites, 15,000 mailboxes
  Virtualized solution running on Unisys ES7000 Servers and Hitachi Adaptable Modular Storage 2000 Family

Note that I’ve added a seperate Tested Solutions page to the References section where I’ll try to keep track of these tested solutions.