How to develop addin for MS Outlook?

Question

How do I develop addin for MS Outlook that works with all 1. Outlook 2010 2. Outlook 2007 3. Outlook 2003

I have developed addin that works well with 2010 and 2007 BUT NOT with 2003.

I want something like this that works well with all the above three :)

Answer 1

You need to go for NetOffice. It will allow you to abstract out from Outlook version. Also it has a powerful diagnostic tool that will tell you which version of outlook your add-in is compatible with based on API features you use in your code.

Worked nicely for me.

http://netoffice.codeplex.com/

Answer 2

You need VSTO (Visual Studio Tools for Office). Here is an article to get you started.

You can also check out Office Development Center.