Given the recent change of direction at Microsoft, it has me worried over how heavily we rely on them. They are already forcing me to buy OEM licencing for Server 2012 with downgrade rights to 2008R2. How long until this is no longer an option? How long until I'm forced to have an XBox interface on my server machines?
I'm not naive enough to assume I can migrate my users from their dependency on MS Office just yet, but I am interested in migrating the core infrastructure away from Microsoft Active Directory and Microsoft Exchange as a good first step.
I'm decently versed in the debian flavors of linux so I would easily adapt to a solution based on something like Ubuntu Server. I discovered with the help of google that Samba 4 aims to do this, but it is currently in alpha and some popular projects built around it have already been abandoned. There's also a product called Zentyal, but I'm a bit confused by their monthly pricing model.
Are any of my fellow sysadmins having the same concerns? I can't in good conscience have all my eggs in Microsoft's basket any longer. What is the best way to transition from a corporate MS environment?