Office365 migration for Acquisition

vignesh R krishnan 21 Reputation points
2021-11-02T05:32:38.527+00:00

Parent/Acquirer company have acquired a new company and as part of Acquisition all Acquiree’s current Infrastructure should be migrated to Acquirer infrastructure
Acquirer DOmain name is A.com & Acquiree Domain name is B.com
▪ Acquirer infrastructure current Infrastructure (A.com) includes Active Directory 2012 R2,Onprem Exchange Server 2016
Hybrid Enabled with O365 and all users enabled with O365 licenses.
▪ Acquiree (B.com) has an infrastructure with AD, Onprem Exchange Server 2016

Below are the solution thought process considered. Is there an better way to migrate it

Option1: Enable Trust, Migrate AD, Groups. Migrate Mailbox from Domain B to Domain A Exchange and then move toOffice 365 from Exchange A( as already Hybird model exists)

Option2: Instead of Migrating users from DOmain B,Create B users as New users in Domain A. Migrated them to Office365 and do a Data Migration from Exchange B to Office365 thats is enabled for DOmain A. Due to budget issue, 3rdparty tool cannot be used for data migration. So In this case should we used PST export import or is there any default exchange migration methods.

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,356 questions
Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
1,895 questions

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  1. KyleXu-MSFT 26,211 Reputation points
    2021-11-03T02:09:53.227+00:00

    @vignesh R krishnan

    For the option 1 (complex and time consuming): This article could help you with ADMT migration.

    For the option 2 (speed is faster, but you may lose mails which received during importing and exporting, double check after migration): You could use "New-MailboxExportRequest" command to export data from mailboxes. Then you could use "network upload" or "drive shipping" to import data to Exchange online mailboxes.

    Extra option (Need to consume extra money): Use hybrid for Acquiree Domain, migrate mailboxes to Exchange online, then cross-tenant mailbox migration to acquirer domain.

    On the whole, the second method is better.

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