Updated the installer to use the Microsoft Installer
Made minor changes to the shutdown logic.
Corrected internal issue when registering shutdown addin on a server.
Corrected a user reported issue between the v1.15 and v1.16 release.
Corrected a reported crash issue with the shutdown process and issues with preserving the nk2 file.
Corrected issue where the addin prevented the nk2 address cache file from saving when Outlook closes.
Set the buy now and register buttons to a hidden state after the product is registered.
