I have a Windows 2008 R2 server running as a KMS server that has been working great activating Windows 7 and Office 2010 in my organization.  The other day I decided I wanted to try out Office 2013 on a computer.  I installed the KMS server piece for office 2013.  Everything installed fine and I entered my Office 2013 KMS key successfully. Now because I only have one computer with Office 2013 installed I am not hitting the threshold and it won't activate.  My bigger problem is none of my Office 2010 clients will activate now either. I keep getting the threshold error with them.  I even went to six individual machines and manually ran ospp.vbs /act  Will my Office 2010 clients not activate now until I get 5 Office 2013 clients?  I would really like to run the two versions of Office side by side in my organization for a while before I make the switch to 2013 completely.

Thanks,

Try reinstall the Microsoft Office 2010 KMS Host License Pack, and enter the KMS host key for Office 2010 to activate the host (*just in case* the 2010 host has been broken when install the 2013 host), and see if we can get the Office 2010 activated again.