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Workaround: A status of 409 - conflict is received when adding an attachment to a mail via WebDAV

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The WebDAV protocol can be used to send emails. This can be done by creating the email in a mailbox folder (i.e. the Drafts folder) and moving this item to the ##DavMailSubmissionURI## folder. This is described in this MSDN article: Sending a Message (WebDAV).

Attachments can be either added to this mail using the Outlook Web Access method, or by issuing a PUT, using the address of the mail as folder: If the address of the item is


the url for the PUT command would be something like http://myserver/exchange/jdoe/drafts/new_mail.eml/

If you created the mail item via the PUT method, instead of a PROPPATCH, you might get a 409  - conflict error when adding attachments to the item.


A workaround seems to be to issue a PROPPATCH on the mail item itself. The PROPPATCH does not necessarily have to change the item. It's more like a touch command. After this PROPPATCH command, the PUT command for the attachment will be successful.


The status of this problem is unknown.

Posted by Henning Krause on Thursday, April 13, 2006 12:00 AM, last modified on Thursday, April 13, 2006 12:00 PM
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