How to create OWA-Uri from ItemType.ItemId?

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When 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%2b6TBVLgtiPtAADeveWKhQQ4TbYfz8fgH%2b6TBVLgtiYuAAAJ

If the service is opening the mailbox of other user then the link looks like:

https://mail/owa/user.name@mydomain.com/?ae=Item&a=Open&t=IPM.Note&id=RgAAAABew%2fP9Bu7QQo5izbUHshDuBwDeveWKhQQ4TbYfz8fgH%2b6TBVLgtiPtAADeveWKhQQ4TbYfz8fgH%2b6TBVLgtiYuAAAJ

The crucial thing in this example is using of the item id property “id=..”

Following code snippet shows how to create it:

private static string createOwaIdForExch2007(ItemType exchMail)
{

string owaUri;

byte[] itemBinId = System.Convert.FromBase64String(exchMail.ItemId.Id);

byte[] owaBinUri = new byte[72];

owaBinUri[0] = 70;

Array.Copy(itemBinId, 27, owaBinUri, 1, 70);

owaBinUri[owaBinUri.Length - 1] = 9 //(means message type);

owaUri = Convert.ToBase64String(owaBinUri);

owaUri = System.Web.HttpUtility.UrlEncode(owaUri);

return owaUri;

}

private static string createOwaIdForExch2010(ItemType exchMail)
{