Behavior of ActiveX controls embedded in Office documentshttp://blogs.technet.com/srd/archive/2009/03/03/behavior-of-activex-controls-embedded-in-office-documents.aspxThe Microsoft Office applications (Word, Excel, PowerPoint, etc) have built-in ActiveX control support. ActiveX support allows a richer experience when interacting with an Office document. For example, a document author could use the Safe-For-Initializationen-USCommunityServer 2.1 SP1 (Build: 61025.2)