有没有办法确定当前的Outlook活动级别？

I am working on an Outlook 2007 Add-in in C# (VS2008) and we want to send some background email items only when Outlook is not busy doing something else. Is there a .net way to see if Outlook is busy doing other things (perhaps due to other add-ins or the like taking up CPU cycles)? I am working on an Outlook 2007 Add-in in C# (V