Make an addin for Office toolbar

Hi guyz, i had made a small encryption program using Visual Studio .Net,
and would like some help as i want to make an add in component, so i can load
the program from the Office toolbar, or to have a choice to encrypt or decrypt
the document.
Thanks in advance for the help, anyone has something to tell plz reply :thumbsup:

I've never done this myselft, so others may have more relevant info to add, but I found these tutorials which looked helpful.

http://www.codeproject.com/com/adwordaddin.asp
http://www.mindcracker.com/mindcracker/c_cafe/atl/BuildingOffice2KCOMAddInAD.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dno2kta/html/mso2kaddin.asp