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What is office 365 tenant to tenant migration?
The O365 tenant to tenant migration is performed using PowerShell scripts or third-party tools. Before that, there is an Office 365 Pre & Post Migration checklist you should keep in mind.

Pre-migration Stage
Step 1. Domain Preparation
Prepare the domain with the following steps:

Ensure that you have enough licenses for the target Office 365.
Create admin accounts in both the source and target to perform the migration smoothly.
Create user mailboxes, room/resource mailboxes, and distribution groups in the target.
If needed, perform AD DS consolidation using AD DS tools and sync source domain with the target domain manually or using synchronization.
Train your end users regarding the post-migration use of Office 365.
Step 2. Domain verification
Start verification of target tenant domain in Office 365.
Add a source domain in the target Office 365 admin center and create TXT records in DNS.
Make sure the domain is in use only one tenant. Otherwise, the verification will fail.

After performing these steps, it will take around 72 hours for the change to be seen.

Step 3. Migration Scheduling
Generate a list of user mailboxes that are to be migrated and create a CSV file for mapping.
Note the lowest value of TTL on MX record (of the primary email domain).
Disable directory sync for source tenant (from Office 365 admin center).
Step 4. Migration Stage
Stop inbound mail flow
Stop inbound mail flow to the source tenant by changing the primary MS record to an unreachable value or by using a third-party service. As you have noted the lowest value of TTL on MX record (of primary email domain) in your preparation step, you can plan the time of this step easily.

Source tenant preparation
Before moving the Office 365 mailbox to another tenant, the primary mail domain should be erased from all objects in the source tenant.

Preparing the target domain
It involves the verification of source tenant in the target domain (do one hour after the previous step).

When you use AD FS, you’ll have to configure a new domain in target tenant for AD FS.
Activate the new user accounts in the target domain and assign licenses.
On the new users, set the source domain as the primary email address (done using Windows PowerShell). Also, decide on communicating the passwords to end users.
Now you can route the emails to the new mailboxes.
Test the mail flow in and out of the target tenant.
Now it is time to decide on the migration method. You can also decide on the type and amount of data to be migrated. Migration can be accomplished using PowerShell scripts. However, third-party migration tools are recommended as they offer complete control over the migration.

To know more about other migration services like hybrid migration office 365 or Office 365 migration visit O365CloudExperts.

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