Why do some conference rooms show with user icons

In my outlook address book, I have a few conference rooms that show an icon as a user and not a door icon like the others.

Any idea why?

We are on o365 and on premise.
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Alexei KuznetsovMicrosoft Outlook MVPCommented:
Open "Active Directory Users and Computers" MMC tool and follow the "Attribute Editor" tab. Find "msExchRecipientTypeDetails" attribute and check its value. It has to be "16" (http://blogs.technet.com/b/dkegg/archive/2014/05/09/msexchrecipienttypedetails.aspx). Also check "msExchRecipientDisplayType" attribute, its value has to be "7" (http://blogs.technet.com/b/johnbai/archive/2013/09/11/o365-msexchangerecipienttypedetails.aspx).

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rdefinoAuthor Commented:
that's odd, since there are other conference room that look fine and they do not have these numbers. Some have different numbers and others do have any numbers set at all for those attribute properties.
rdefinoAuthor Commented:
this was it. need to set as room. thanks
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