Hi we have an irritating problem with our exchange 2010 sp1 server. Autodiscover works fine, but it returns a default username of the person's primary email address. Our upn is different, so that won't work. they have to know to change it. We have multiple suffixes hosted on a single domain, so I can't simply set the upn to match the primary email. so primary email=bob.findlay@xxx.ac.uk upn=findlay@yyy.ac.uk autodiscover returns bob.findlay@xxx.ac.uk as the account name, which won't work. any ideas?Bob

sorry, but that's not an answer to my question.Bob

Did you ever find a solution to your problem? We are having the same issue but with hosted Exchange Online.

no, sorry.Bob