Hello all,
A few days ago, I had to make a user in a local AD appearing as a contact in O365 address book.
The local AD was not having a local Exchange so I couldn’t use the ECP to populate the right attribute…
Here are the required attribute to fill in the local AD user to make it appear in O365 address book as a contact (mail user):
mail = externalemail@domain.com
mailNickName = internal.username (should be the same value as samAccountName)
targetAddress = SMTP:externalemail@domain.com
proxyAddresses = SMTP:externalemail@domain.com
Hope this will save time to you