Save mail to msg file using EWS API

Question

I\'m using Exchange Web Services Managed API 1.1 to connect to Exchange server 2010 and then find out new emails received. Now I want to save a copy of the .msg file to a fo

Answer 1

You can easily access the MIME contents of the message through message.MimeContent and save the message as an EML file. The latest (2013 and 2016) versions of Outlook will be able to open EML files directly.

message.Load(new PropertySet(ItemSchema.MimeContent));
MimeContent mimcon = message.MimeContent;
FileStream fStream = new FileStream("c:\test.eml", FileMode.Create);
fStream.Write(mimcon.Content, 0, mimcon.Content.Length);
fStream.Close();

If you still need to convert to the MSG format, you have a few options:

1) MSG file format is documented - it is an OLE store (IStorage) file. See https://msdn.microsoft.com/en-us/library/cc463912(v=exchg.80).aspx

2) Use a third party MSG file wrapper, such as the one from Independentsoft: http://www.independentsoft.de/msg/index.html. Setting all properties that Outlook expects can be challenging.

3) Convert EML file to MSG directly using Redemption:

set Session = CreateObject("Redemption.RDOSession")
set Msg = Session.CreateMessageFromMsgFile("c:\test.msg")
Msg.Import("c:\test.eml", 1024)
Msg.Save