MDDR in user agent string

Question

What do MDDR means in a user agent string?

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; MDDR; InfoPath.1; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; OfficeLiveConnector.1.4; OfficeLivePatch.1.3)

Answer 1

Most puzzling, this question has been asked since a while ;)

My hunch based on http://www.zytrax.com/tech/web/msie-history.html and http://www.vistaheads.com/forums/microsoft-public-internetexplorer-general/460619-what-do-mddr-stands-user-agent-string.html and http://dell.msn.com/?pc=MDDC is that MDDR is a variant of MDDC and basically it would be an OEM modified version (by Dell) of IE.