I'm creating a secure message alternative to email for my organization. We exchange confidential patient information with outside treatment providers. To protect privacy, we cannot use email for this purpose.
Rather than force the users here to use whole new inbox, outbox, and authoring interfaces in addition to the Outlook/Exchange email they're used to, is it possible for me to simply add a "Send Secure" button that will direct their message to my custom service rather than the email server?
Microsoft Outlook With New Button http://img38.imageshack.us/img38/5140/newbutton.gif
I've never created an add-in for an Office application. Is it possible to do this? How should I get started?
You absolutely can. You can use VSTO to do it. Here is an example of adding a context menu item to folders, but adding a button is very similar exercise.