As more and more companies undertake Office 365 for their services, there is an expansion in demand for Office 365 Tenant to Tenant Migration. In some situations, the basic Office 365 tenant is in a cloud-hosted platform on a Microsoft system. Yet most Office 365 tenants are on the same shared Microsoft platform, the data is entirely separated for each tenant. While this separation is existing, there still is the capacity to set up several levels of the federation and share between two different Office 365 tenants. Office 365 Tenant to Tenant Migration is very similar to when you Migrate SharePoint 2010 to SharePoint Online
The important issue here is there are limitations on collaboration platforms among tenants; consider two people from separate tenants attempting to run the same document in SharePoint Online, Microsoft Teams or OneDrive for Business. Similarly, a company has no other option to try and maintain users, licenses, security policies, etc. in a couple of tenants as well as typically two different AD Forests.
How to Fix this?
Typically, a business can choose one of four things:
- Merge Office 365 Tenants and AD Forests
- Standard Approach.
- Use third-party tools to transfer all Office 365 data and information to the Target business tenant.
- Use scripting and third-party tools to transfer AD Forest objects to the Target business AD Forest.
- All traditional network shares and applications in the root AD Forest are however available across two-way domain support until transferred, decommissioned, or else remediated.
- Merge Office 365 Tenants and Leave AD Forests
- If you require a fast and sloppy way to bring both Source and Target users in similar Office 365 tenants.
- Use third-party tools to move all Office 365 data and information to the Target business tenant.
- Install two-way domain support among the Source and the Target AD Forests.
- Hold current AADC (Azure Active Directory Connect) in the Target AD Forest to link into the two-Way domain support to make a replica Source AD data to the Target Office 365 Azure AD.
- Merge Office 365 Tenants and Design Net-New AD User Data
- Usually, smaller divestitures and acquisitions.
- Use third-party tools to transfer all Office 365 data and objects to the Target business tenant.
- Target business creates new hardware on their domain for the acquisition users accounts.
- Legacy Source AD forest data and/or services are either available through two-way domain support or left as it is in service of the Target business’s current services serving the same information and normally would be archived later.
- Net-New Everything and Migrate Nothing
- This is uncommon but a few Legal and Government organizations need this for the security agreement.
- All the Source Office 365 and on-premises data and services are not considered here.
- Net-new hardware and AD User information are built in Target business AD Forest.
- Legacy Source services and data may be available for specific Information Security departments for some time before getting deleted or archived.
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