In Exchange O365 GUI, in Contacts  I see contact type: mailcontact and mail user. What is the difference?

SAM2009
SAM2009 used Ask the Experts™
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Hi,

In Exchange O365 GUI, in Contacts  I see contact type: mailcontact and mail user. What is the difference?
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timgreen7077Exchange Engineer
Distinguished Expert 2018

Commented:
mail contact is the typical email contact that has no permissions, while mail user not only have email contact associated with it, its actually a user object that you can set permissions on and allow user authentication.
Exchange Engineer
Distinguished Expert 2018
Commented:
Here is a little better explanation for you:

Mail contacts are mail-enabled directory service objects that contain information about people or organizations that exist outside your Exchange or Exchange Online organization. Each mail contact has an external email address.

Mail users (also known as mail-enabled users) have email addresses and accounts in the Exchange organization, but they don't have Exchange mailboxes. Email messages sent to mail users are delivered to the specified external email address.

Mail users are similar to mail contacts. ... However, unlike a mail contact, a mail user has logon credentials in your Exchange or Office 365 organization and can access resources.

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Thanks!

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