How to sync On-Promise Ad Account when Office 365 accounts exist ?

Question

Hello,

I have an AD On-Promise and i have Office 365 accounts but no sync to Azure.

The AD users accounts and the Office 365 Accounts don't have the same password.

I now want to synchronize my AD to Azure. But I would like to know how the Offices 365 accounts and the AD Accounts will synchronize.

Will the link be made automatically, or do we have to associate each O365 account with an AD account when the sync is finished? Is it possible to loose Office 365 accounts data (like emails) ?

Thanks for the reply

Answer 1

The whole process is explained here; https://learn.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-install-existing-tenant

You won't lose any data but object attributes in Azure AD will be overwritten. That is also explained in the guide.

Answer 2

Hi @Jean ALBERT

To sync on-prem AD and office365 user accounts, you required Azure AD connect tool.

Azure Active Directory (Azure AD) Connect allows your users to sign in to both cloud and on-premises resources by using the same passwords.
https://learn.microsoft.com/en-us/azure/active-directory/hybrid/plan-connect-user-signin

Topologies for Azure AD Connect
https://learn.microsoft.com/en-us/azure/active-directory/hybrid/plan-connect-topologies

Deploy Seamless Single Sign-On
https://learn.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-sso-quick-start#deploy-seamless-single-sign-on

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Answer 3

@Jean ALBERT

Whether this user have Exchange on-premises mailbox?

If this user doesn't have Exchange on-premises mailbox, you could make sure local AD account and Azure AD account have the same attributes (first name, last name, UPN, primary SMTP address, etc.) Then the AAD connect will soft-match those two accounts automatically.

If this user has both Exchange on-premises and Exchange online mailbox, the duplicate cloud mailbox will be purged. I would suggest you backup Exchange online mailbox first. Then delete Exchange online, after connect local AD and Azure AD account, migrate Exchange on-premises mailbox to Exchange online.

For detailed information, you could have a look about this article: How to merge an Office 365 account with an on-premises AD account after hybrid configuration?
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

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