In a recent conversation with the Dynamics CRM products team the topic of supportability recently came up between different User Rollups(UR). Sustained Engineering does some testing against both scenarios, i.e. higher UR version on servers vs. clients...
Ever wondered which server model numbers support the operating system your are going to deploy. I found these handy webpages for Dell and HP which lists models with supported operating systems. Operating System Support Matrix for Dell PowerEdge Systems...