1.3.4 WebDAV Property Naming

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The email server is natively a Messaging Application Programming Interface (MAPI) message store where the vast majority of properties in it are MAPI properties. The WebDAV implementation uses the Augmented Backus-Naur Form (ABNF) notation, as described in [RFC5234], as a way to name MAPI properties, allowing Web Distributed Authoring and Versioning Protocol (WebDAV) clients to work with these properties directly.

The http://schemas.microsoft.com/mapi/ namespace is used to access MAPI properties directly on the server. The namespace consists of three sub namespaces: proptag, id, and string. The ABNF notation used to specify the format of these namespaces is described in this section.