Connect office365 mailbox to new created account

Question

Hi Team,

Our company did the merger and now we have been asked to move only 25 corp.loal users to corp.com .

1.Corp.local domain has hybrid environment and having the mailboxes in tenant xyz.com and sync is inplace with Local AD.

2.Corp.com has only cloud only environment and sync in place with local AD and mailboxes in tenant xyz.com

Corp.local and Corp.com users have the mailboxes in the same tenant(xyz.com)

Please guide me how can move those account to Corp.com by keeping all the mailbox data intact.

I am thinking about below plan:

1)Move the corp.local account to non-syn OU so office365 will get deleted.
2)Restore the Office365 account and get the immutabel id
3)Create a new account in non-sync OU of corp.com and stamp the Immutableid to AD user attribute Objectguid.
4)Move the account to Sync OU and let it get sync.

Please let me know whether the above steps would able to connect the mailbox without losing any data.

Answer 1

Hi @pankaj Exchange ,
The Corp.com is an AD that is synchronized with the tenant xyz.com and does not have an Exchange server installed. You want to migrate users in corp.local to corp.com and synchronize with mailboxes in Office 365. If I understand wrong, please correct me in time.

According to my research, your action plan is feasible. First, you need to remove the mailboxes in corp.local from the hybrid deployment, just as you did in the first step. Make these mailboxes only exist in the cloud. After that, you could create user accounts in corp.com and synchronize these mailboxes with the on-premises AD through SMTP matching.

But it should be noted that the users in your corp.local have been synchronized with the mailboxes in office 365. If you create a new account in on-premises, the GUID of the local account may not match the immutable ID value in your Azure account, causing the synchronization to fail. At this time you need to perform Hard Match using the GUID / immutable ID. And you will still need to ensure that the UPN suffixes match the primary email domain on-premises and in the cloud.

About synchronize the on-premises user account with the Office 365 user account, you could refer to: How to use SMTP matching to match on-premises user accounts to Office 365 user accounts for directory synchronization
About the “ImmutableID Hard Match in Azure AD Connect” and how to convert, you could refer to: Soft (SMTP) vs. Hard (immutableID) matching with Azure AD Connect and ImmutableID Hard Match in Azure AD Connect
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