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Office 365 tenant to tenant migrations & co-existence

Office 365 tenant to tenant migration

Merge, split or move between Office 365 tenants

When you need to migrate or merge Office 365 tenants, moving data and users is just the tip of the iceberg, especially if you have multiple domains that must co-exist for any length of time.

  • You need to synchronise contacts and free/busy information to ensure co-workers can email and collaborate easily and communicate with clients throughout the migration – as though in a single domain.
  • You may also need to consolidate the infrastructure of the merging organisations, starting with integrating the separate Active Directory (AD) instances into one.
  • Not all the organisations involved may be in the cloud – so there may be added complexity in integrating on-premises users and applications.

There’s other things to transfer across and rationalise, including security, privacy, anti-spam, legal holds and retention management policies.

In fact, the amount of up-front planning, project management, communication and post-migration clean-up activities involved to ensure a fault-free tenant to tenant migration can be daunting, with no ‘one size fits all’ third-party solution and no off-the-shelf solution from Microsoft*.

Cloud Essentials combines best-of-breed solutions with expert services to assist with your tenant to tenant migration, including Mailbox, SharePoint & OneDrive moves, synchronisation and merging of infrastructure and the seamless switching of services such as email and Teams.

*STOP PRESS:  Microsoft recently announced their tenant to tenant mailbox move capability, which is suitable for just moving mailboxes for less than 500 users.  Get in touch to discuss the additional services we can offer as your Office 365 partner.

Cloud Essentials unified and consolidated our two Office 365 tenants and 12 domains into a single tenant while minimising disruption to over 15,000 staff in offices around the world.

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Migrate User Mailboxes & Calendars Between Tenants

We offer a full suite of Office 365 tenant to tenant migration tools and services to cover all your needs, including enterprise coexistence (calendar free/busy, mail routing and GALSync) that will enable your users to work seamlessly (and your clients to maintain contact) as you transition.

Items migrated include:


Shared mailboxes



Secondary calendars

Distribution lists


Delegations and permissions

Rooms and equipment




Inbound rules

Litigation hold folders

Online archives

PXP Solutions & Kalixa merge & rebrand their Office 365 environments with Cloud Essentials

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OneDrive Migration Between Tenants

Migrate a OneDrive environment to OneDrive or SharePoint Online in another tenant.  We can help you audit and report on your existing environment to help plan, configure and selectively migrate content.

You can choose to keep or overwrite existing files at the OneDrive or SharePoint destination, as well as whether to migrate metadata such as file creation details.

Items migrated include:







Uploaded files (eg: .pdf, .jpg)

SharePoint Migration Between Tenants

No matter how complex your SharePoint environment, we can help you work out the optimum tenant to tenant migration or upgrade path.

We recommend starting with an in-depth profile of your current environment, including permissions, governance and usage. You can then determine what needs to be moved (and what can be excluded), fix any problems and get an overall view of how much effort is involved.

Re-branding a new tenant and helping drive user adoption of the new SharePoint site can also be included as part of our service.

We use the latest technology and APIs for fast and simple migrations that maintain data integrity, permission levels, version histories and metadata.

We can also import from shared drives, Google Drive and Drop Box into SharePoint libraries and export data that will not go to the new SharePoint into Shared drives.

Items migrated include:

Top Navigation bar

Quick Launch bar

Site Structure


Welcome Page



Custom Forms (e.g. Nintex)

Discussion Board


Workflows (e.g. Nintex)


TermStore (Taxonomy)

Web Fields (columns)

Composed Looks

Metadata & Permissions

Active Directory Consolidation

As well as synchronising your AD environments in the first phase of your move, we can help you design the ideal AD schema for your new combined organisation.

This includes reviewing existing objects, groups, devices, data, security, policies etc., determining any changes to these components and planning for growth.  We can also ensure any legacy AD naming structures and attributes are removed.

Items synchronised and moved include:

Objects, settings & properties

All types of users – even remote

Disconnected & isolated objects

Moves within & between forests

Highly complex scenarios

Roll back changes

Highly secure – no firewall ports

Migrate during business hours

Get complete visibility

Reports, charts & diagrams

Let our experts handle the complexity of your tenant to tenant migration project.

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