 <p>You can use the MAPISendMail api from MAPI. I used this in the past in some projects.</p> <p>You can pass the function the MAPI_DIALOG flag to tell it to open a dialog for the user.</p> <p>See for example: <a href="http://sundararajana.blogspot.de/2007/09/mapisendmail-in-c-application.html" rel="nofollow">http://sundararajana.blogspot.de/2007/09/mapisendmail-in-c-application.html</a> http://www.codeproject.com/Articles/2048/Simple-MAPI-NET</p> <p>An alternative might be the Office Interop APIs, but I think they will be more complicated to work with. Also MAPI should work with other email clients thatn outlook as well (in theory at least).</p> <p>Hope that helps!</p>