SPSVienna Office 365 Tenant to Tenant Migration - a complete Survial Guide

1. Office 365 Tenant to Tenant Migration
– a Complete Survival Guide
Stephan Bisser

2. Stephan Bisser
• Consultant @SOLVION (O365 & Azure)
• P-TSP @Microsoft for Azure
• AI (Cognitive Services & Bots), Azure &
O365
• Soccer
@cloudguy_pro
AskCloudguy
www.cloudguy.pro
stephan@cloudguy.pro

3. What will I speak about?
Outlook
Lessons
Learned
Service
Migration
ScenariosProblem

4. What is the actual PROBLEM?
• Mergers and Carve-Outs quite common
• Multicorporate enterprises often acquire & incorporate “smaller”
companies  Nearly all use O365
• 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. Which SCENARIOS will you face?
• 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?
https://docs.microsoft.com/en-us/azure/active-directory/connect/active-directory-aadconnect-topologies

7. Which COMPONENTS to migrate?
Azure Active Directory Exchange Online SharePoint Online Skype for Business Online
Users & Groups Mails Contacts
CalendarsArchives
Sites
OD4B
Conversation History

8. But HOW?

10. AZURE ACTIVE DIRECTORY
• Cloud-only, synced or federated identity
• Cloud-only  Export/Import via PowerShell
• Synced & Federated  AADConnect tenant switch
• Office 365 Groups migration possible
• Creation of groups in destination manually
• Migration of SPO/ExO Content via 3rd Party tool

11. EXCHANGE ONLINE
• No built-in way
• No PST Export available in Exchange Online currently
• Only big bang per domain possible

12. EXCHANGE ONLINE – First Approach
• Challenging
• Resources
• User count
• 2 Migrations
On-premises or Azure
O365 Tenant A O365 Tenant B
Exchange Server Hybrid Org

13. 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 (if not done by tool)

14. EXCHANGE ONLINE

15. EXCHANGE ONLINE - Permissions
Get-MailboxPermission -Identity <UPN>
Get-MailboxFolderPermission –Identity
“<UPN>:<FolderName>“
Get-RecipientPermission -Identity <UPN>

16. EXCHANGE ONLINE - Permissions
Add-MailboxPermission -Identity <UPN> -AccessRights
<AccessRights>
Set-Mailbox -Identity <UPN> -GrantSendOnBehalfTo <UPN>
Add-MailboxFolderPermission –Identity
“<UPN>:<FolderName>“ –AccessRights <AccessRights> -User
<UPN>
Add-RecipientPermission -Identity <UPN> -AccessRights
<AccessRights> -Trustee <UPN>

17. 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

18. SHAREPOINT ONLINE

19. SKYPE FOR BUSINESS ONLINE
• Conversation History is stored in user’s mailbox
• No further migration needed/available as users are
migrated anyway

20. What about Microsoft Teams?

21. MICROSOFT TEAMS
• Teams combines nearly each O365 service
• At the moment each service would need to be
migrated separately (ExO, SPO, …)
• API will be released soon  Export/Import of
Teams/Channels/Threads possible?
• Re-Deployment of Teams Apps

22. What have we LEARNT?
• Many small stumbling blocks (permissions, customizations, …)
• Use of 3rd Party tool important
• Planning is the key to success
• Test drives essential
• Backup your data
• Inform your users

23. What does the FUTURE hold?
• Cross-Tenant Mailbox Move on roadmap (12-18 months) announced
at Ignite 2017 *
• Microsoft Teams API coming (PSModule already available) 
Migration?
• …
* https://vanhybrid.com/2017/09/28/summary-of-announcements-for-hybrid-exchange-ignite/

26. If you want to know
more pls contact me:
@cloudguy_pro
#AskCloudguy
https://www.cloudguy.pro
stephan@cloudguy.pro