1. Office 365 Tenant to Tenant Migration - a Complete Survival Guide
Stephan Bisser
@cloudguy_pro

2. Stephan Bisser SOLVION information management
A couple of years ago I started digging deeper in the MS cloud stack (O365 & Azure). Starting as a SharePoint System Specialist at SOLVION I started to setup and design SharePoint farms from an infrastructure perspective. During the daily project business I started to help customers onboard in O365 & Azure. I already did some relative large hybrid Office 365 infrastructure designs and Azure hybrid architectures. I also did a few O365 tenant 2 tenant migrations, which is a quite new topic. Now I’m focusing on Microsoft’s AI stack (Cognitive Services & Bots mainly) to make the cloud more intelligent…
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3. Agenda
Problem
Scenarios
Service migration
Lessons learned

4. Problem Mergers and Carve-Outs quite common Office 365 widely used
Multicorporate enterprises often incorporate “smaller” companies
Spin-Offs are trending due to agile companies
Office 365 widely used
No out-of-the-box migration service by Microsoft available yet  3rd Party tools

5. Scenarios
Enterprise which uses O365 disincorporates subsidiary  Subsidiary wants to keep O365
Enterprise which uses O365 integrates new company which uses O365 already  Merge both tenants or setup collaboration features?

6. Single or Multitenancy?VS

7. Components to be migrated
Users & Groups
Mails
Contacts
Calendars
Archives
Sites
OD4B
Conversation History
Azure Active Directory
Exchange Online
SharePoint Online
Skype for Business Online

8. How to migrate?

9. Components to be migrated
Users & Groups
Mails
Contacts
Calendars
Archives
Sites
OD4B
Conversation History
Azure Active Directory
Exchange Online
SharePoint Online
Skype for Business Online

10. Azure Active Directory
Cloud-only, synced or federated identity
Cloud-only  Export/Import via PowerShell
Synced & Federated  AADConnect tenant switch
Users & Groups
Azure Active Directory

11. Azure Active Directory
Office 365 Groups migration possible
Creation of groups in destination manually
Migration of SPO/ExO Content via 3rd Party tool
Users & Groups
Azure Active Directory

12. Components to be migrated
Users & Groups
Mails
Contacts
Calendars
Archives
Sites
OD4B
Conversation History
Azure Active Directory
Exchange Online
SharePoint Online
Skype for Business Online

13. Exchange Online No built-in way
No PST Export available in Exchange Online currently
Only big bang per domain possible
Cross-Tenant Mailbox move announced at Ignite 2017
Archives
Calendars
Mails
Contacts
Exchange Online

14. Exchange Online Challenging Resources User count Archives Calendars
Mails
Contacts
Exchange Online

15. Exchange Online 3rd Party tools preferred
Migrate usually everything inside mailbox except permissions
Pre-Stage migrations save time during switch
Reconfigure Outlook profiles and recreate client-side customizations
Archives
Calendars
Mails
Contacts
Exchange Online

16. Archives
Calendars
Mails
Contacts
Exchange Online

17. Components to be migrated
Users & Groups
Mails
Contacts
Calendars
Archives
Sites
OD4B
Conversation History
Azure Active Directory
Exchange Online
SharePoint Online
Skype for Business Online

18. SharePoint Online Manual migration via OD4B sync client possible
3rd Party tools preferred
Permissions and metadata can be migrated by some tools
Throttling  Batched migration
OD4B
Sites
SharePoint Online

19. OD4B
Sites
SharePoint Online

20. Components to be migrated
Users & Groups
Mails
Contacts
Calendars
Archives
Sites
OD4B
Conversation History
Azure Active Directory
Exchange Online
SharePoint Online
Skype for Business Online

21. Skype for Business Online
Conversation History is stored in user’s mailbox
No further migration needed/available as users are migrated anyway
Conversation History
Skype for Business Online

22. What about Teams? Mails Contacts Calendars Conversation History OD4B
Sites
Channels
Notebooks
Microsoft Teams

23. What about Teams? Teams combines nearly each O365 service
At the moment each service would need to be migrated separately
Microsoft Teams

24. Lessons Learned
Many small stumbling blocks (permissions, customizations, …)
Use of 3rd Party tool important
Planning is the key to success
Test drives essential
Cross-Tenant migration on roadmap (12-18 months)* *

26. Office 365 Tenant to Tenant Migration - a Complete Survival Guide
Stephan Bisser
@cloudguy_pro