Difference between mail user and mail contact?

Dear Experts,

Thanks in advance.
I would like to know difference between mail user and mail contact? . I think both have an email address outside Exchange Organization then whats the difference?
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JJ KRWindows System administratorAsked:
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Professor JMicrosoft Excel ExpertCommented:
Mail users are similar to mail contacts. Both have external email addresses and both contain information about people outside your Exchange or Exchange Online organization that can be displayed in the shared address book and other address lists. However, unlike a mail contact, a mail user has logon credentials in your Exchange or Office 365 organization and can access resources.
https://community.office365.com/en-us/f/613/t/199455

Also
http://searchexchange.techtarget.com/tip/Distinguishing-between-mail-contacts-and-mail-users-in-Exchange-2010

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JJ KRWindows System administratorAuthor Commented:
Thanks a lot U have cleared my doubts
Professor JMicrosoft Excel ExpertCommented:
You are welcome.
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