Office 2007 component programmes do not skin well as they have their own inbuilt skin apparatus due to the way the ribbon works, they are at their worst at maximum window size in that max/min/close buttons get truncated and the Quick Access bar may also be affected too. What can be done will be done to work as best as can by the skinner subject to limits imposed by the program eg Opera totally skins itself with its own skins, IE8 has limited skinnability for windowblinds thus far, FF3 has limits but some compromises can be set via the skinner using using substyles in the blind manufacture.
If issues are significant and look ugly it is best to set exclusions for affected programmes in windowblinds.
Office 2007 can be altered a fair bit, just look here
