On-Premise Active Directory to Office365 Azure AD

Joaquim Feit 1 Reputation point
2020-08-13T16:07:26.67+00:00

We are trying to move our On-Premise AD to the Active Directory that was made by Office365. I just want to confirm, if users on-premise have the same username as their Office365 username, they will be synced up with the correct Office365 user? So they will have access to their emails with their on-premise password? Also, there were a lot of random guest users in the AD. They looked like contacts, will they be deleted?

Thank you

Microsoft Entra ID
Microsoft Entra ID
A Microsoft Entra identity service that provides identity management and access control capabilities. Replaces Azure Active Directory.
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  1. Jon Alfred Smith 541 Reputation points
    2020-08-13T16:37:59.213+00:00

    Make sure that your users have a routable UPN. It must not be jonsmi@keyman .local, but jonsmi@keyman .com. Best practice is to make sure that the UPN and e-mail address are identical.

    If you have to add a routable domain suffix, use AD Domains and Trusts for that.
    https://video2.skills-academy.com/en-us/office365/enterprise/prepare-a-non-routable-domain-for-directory-synchronization#add-upn-suffixes-and-update-your-users-to-them

    Don't sync everything in your local AD. Do a OU filtering. Chose Password Hash and SSO. This requires a Custom configuartion of Azure AD Connect
    https://video2.skills-academy.com/en-us/azure/active-directory/hybrid/how-to-connect-install-custom

    Start with a small number of users.

    As to syncing Local Active Directory Contacts. This is supported.
    https://techcommunity.microsoft.com/t5/office-365/syncing-local-active-directory-contacts/m-p/94947

    --please don't forget to Accept as answer if the reply is helpful--

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  2. James Hamil 24,311 Reputation points Microsoft Employee
    2020-08-31T18:38:34.657+00:00

    Hi, are there any updates with this case? If not, please select the appropriate response as "Answered." Otherwise please let us know how we can assist you.

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