http://developers.de/blogs/damir_dobric/archive/2010/04/15/how-to-create-owa-uri-from-itemtype-itemid.aspxWhen working with Exchange Web Service at some point of time you will want to create the OWA-URI. The Owa URI looks like: https://mail/owa/?ae=Item&a=Open&t=IPM.Note&id=RgAAAABew%2fP9Bu7QQo5izbUHshDuBwDeveWKhQQ4TbYfz8fgH%2b6TBVLgtiPtAADeveWKhQQ4TbYfz8fgHenCommunityServer 2008 SP1 (Build: 30619.63)