AutoCAD Architecture Customization

[#1]

My AutoCAD Architecture 2011 program is missing the button to export to an earlier version of AutoCAD. I have seen this button on other computers at our office. I need to export some drawings to earlier versions without having to bind exrefs and do a 'save as' earlier version. 

Does anyone know how I can get this button back? Does it have anything to do with DWG Truview?

Here are two screen shots, one with the button, and one without.

 

[#2]

This is just a thought, but you wouldnt have happened to have started Autocad Architecture with an Autocad profile by mistake would you?  I don't know for sure, but that particular function might be missing from the standard Autocad profile as you would just use the save as function instead.

[#3]

Not that I'm aware of, but thank you for the reply.