I loaded up a fresh copy of ReactOS and installed Office 2007. The install was fine. However, all of the apps have MAJOR render issues. The debug log is spammed with :
(../../win32ss/user/ntuser/caret.c:48) err: Failed to get bitmap dimensions
(../../win32ss/user/ntuser/windc.c:757) err:  GetDC() without ReleaseDC()!
and sometimes (../../win32ss/user/ntuser/windc.c:596) err: Should not be called!!
We can assume that Office 2010 would possibly be affected with this same issue.