Microsoft's first foray into self-branded computing will be with a device that's unable to join a Windows Domain. Microsoft might have dominion over Apple in the enterprise, but Surface for Windows RT tablets will present the same management challenges as any other BYOD. This could have been an iPad-killing advantage of a Microsoft Tablet, but instead it hobbles Windows-on-ARM devices in terms of enterprise security and manageability.
And, it's a condition that isn't likely to change any time soon. At Microsoft's TechEd conference last week, the company was unwilling even to address questions about Windows RT's ability to join a domain, let alone estimate when it might be able to do so. Domain-member PCs can be managed by Active Directory to receive network and security policy changes and other updates.