OWA provides most of this functionality through Options. However the two fields you have asked for are not included.
This thread is quite interesting on the subject.
http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/b491efb9-093d-4236-89a0-307041284765
It looks like either a custom interface or third party tool. Microsoft used to have a tool called GALMOD which allows the users to update a lot of things, but I don't think it works with the later versions of Outlook.
Simon.
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