Hi Customer,
I am sorry that we have limited resources about GPO to uninstall Office2010 in this forum. I just first share a workaround with you in the following thread:
http://community.office365.com/en-us/f/172/t/169303.aspx
If there are further questions, to ensure you get the dedicated support, it is suggested you post the question in TechNet forum: Office 2010 - Planning, Deployment, and Compatibility. The support engineers and the community members in that forum will assist you further. We sincerely appreciate your understanding.
Regarding deploying Office365 for mass users, for your reference, below is a related article about Office Deployment Tool:
http://technet.microsoft.com/en-us/library/gg998766(v=office.15).aspx
Best regards,
Rachel Zhang