We currently use Microsoft.Office.Interop.Outlook to Open Outlook with a preformatted MailItem. This is so the user can change any information before the email is sent.
Searched Exchange WebServices but did not find equivalent.
I cleaned the code below as much as possible. We would like to open a message in the current version of Outlook on our users Desktops. For now, we have Exchange on prem and Office 2010 we are moving to Office 2016 and O365 in the cloud.
Public Function OpenOutlookSendWithAttachment(ByVal Subject As String, ByVal Body As String, ByVal FileName As String) As Boolean
Dim bSuccess As Boolean = True
Dim OutlookApplication As Microsoft.Office.Interop.Outlook.Application
Dim OutlookMailItem As Microsoft.Office.Interop.Outlook.MailItem
Try
OutlookApplication = New Microsoft.Office.Interop.Outlook.Application
Try
If OutlookApplication.Session.Offline Then OutlookApplication.Session.Logon("", "", True, True)
Catch ex As Exception
End Try
OutlookMailItem = OutlookApplication.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olMailItem)
OutlookMailItem.Subject = Subject
OutlookMailItem.Body = Body & vbNewLine
OutlookMailItem.Attachments.Add(FileName)
OutlookMailItem.Display(True)
Catch ex As Exception
bSuccess = False
Finally
OutlookMailItem = Nothing
OutlookApplication = Nothing
End Try
Return bSuccess
End Function
Looking for any .Net method to perform the equivalent.
You can use either a mailto link (which does not support attachments) or create an MSG (binary) or EML (MIME text) file: Outlook will be happy to open and show it.
In the latter case (.EML file), don't forget to add "X-Unsent: 1" MIME header to force Outlook to treat the message as unsent and show the Send button.