63ea5cd0_uary_2012___Spoon_User_s_Guide__Question_Issue
[Solution] Microsoft Office 2007 and 2010 have some shared registry keys. Because of this, the applications are not able to be run in the same sandbox. This is the same as if you had both versions installed locally. In order to have both versions, you would need to different applications and ensure the sandbox path for each is unique. This applies to all Microsoft Office applications. [Question/Issue] 
I have Excel 2007 and Excel 2010. I tried adding both my Microsoft Office 2007 and Microsoft Office 2010 applications to my desktop in the same directory and they will not work. Why is that?
Spoon Virtual Application Studio FAQ - Spoon Documentation - January 2012 - Spoon User's Guide
Question/Issue