outlook security in asp.net webpage

I used http://www.everythingaccess.com/tutorials.asp?ID=Outlook-Send-E-mail-Wit开发者_如何学运维hout-Security-Warning , to finish my first ms access vba app that sends multiple notifications via outlook, without security pop-up. Now I want to make a WEB BASED version of it. So, using asp.net & mysql instead of vba & access raises certain questions.

When I comes down to it, what would be the difference of using (will post link below) vs installing VSTO runtime to run the outlook module I allready used in my first link?

Would you consider the "add-in" a more robust, integrated, easy approach since it seems I'd otherwise need to put the module of my first link in each users outlook install or am I just completely mistaken or is it a combination of both, please explain...

Click below for

2nd link of first post , outlook addin