DragAndDrop in Outlook - is it a mail, an attachment or a file?
If you are developing an addin for outlook and you are building a drag and drop able control, you will need to check what kind of data droped in. In the following code I made differences between those three types: files from the filesystem, mails out of Outlook and attachments that came from mails in Outlook. I used the DragEventArgs to figure out what was droped and then I handle each way a bit different.