Save emails in MSG format using EWS APIs

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Hi,

I am working on a solution to to extract emails from exchange using EWS APIs and then upload to SharePoint online . Below is the sample code for file creation, and before upload to sharepoint.

string mSubject = mItem.Subject;
string targetFileURL = targetFolderUrl + "/" + Regex.Replace(mSubject, @"[^\w\.@-]", "", RegexOptions.None, TimeSpan.FromSeconds(1.5));

//limit URL to 150 characters
if (targetFileURL.Length > 150)
targetFileURL = targetFileURL.Substring(0, 150) +".eml";
else
targetFileURL = targetFileURL + ".eml";

mItem.Load(new PropertySet(ItemSchema.MimeContent));
MimeContent mc = mItem.MimeContent;
FileCreationInformation newFile = new FileCreationInformation();
newFile.Content = mc.Content;
newFile.Url = targetFileURL;
newFile.Overwrite = true;

It works perfectly well for .EML format but when I try to save the file in .MSG format it throws error.

Any suggestions on how to save the file in proper MSG format? Will greatly appreciate quick responses.

Thanks

Posted 14-Apr-15 5:46am

Member 11606873

Updated 14-Apr-15 6:23am

v2

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Sergey Alexandrovich Kryukov 14-Apr-15 15:38pm

Of course, because MSG format is different. "it throws error" is not informative (and not correct: it may throw exception :-).
Do you mean Outlook MSG or something else?
—SA

Member 11606873 14-Apr-15 15:44pm

Exact exception thrown is

"Cannot open "Filename.MSG". Its possible the file is already open or you don't have permissions to open it.
To check your permissions, right click the file folder and then click properties."

and yes I mean outlook MSG only.

I understand that the format is different, and so please suggest how i should save the MSG format?

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-04-14T10:02:00

It's possible that Outlook is running and the file is opened for exclusive use by Outlook (this is the default way of opening files).

If this is that problem (no matter if your access is blocked by outlook or any other process), you can use the Sysinternals utility "handle.exe". For further detail and the explanation on how you investigate such case, please see my past answer:
how to compress the error 'it is already used by another process' in vb.net[^].

If the problem is just permission, just check up permission. Then you may need to just run your application as administrator. (I doubt this is the case though.)

If you really need to work with MSG, you need to understand that the format is proprietary, so many relevant products, even 3rd-party ones, will be commercial. But you don't have to use such products, as the format is described in publicly available publications. Please see: https://msdn.microsoft.com/en-us/library/cc463912.aspx[^].

See also this very popular CodeProject article: Reading an Outlook MSG File in C#[^].

Sorry that his article is only for reading, but it still can be helpful.

See also: http://blogs.msdn.com/b/openspecification/archive/2009/11/06/msg-file-format-part-1.aspx[^].

—SA