Office 365 Tenant to Tenant Migration - a Complete Survival Guide Stephan Bisser @cloudguy_pro www.cloudguy.pro www.solvion.net

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… Email : stephan@cloudguy.pro Twitter : @cloudguy_pro Facebook : Stephan Clouguy LinkedIn : Stephan Bisser

Agenda Problem Scenarios Service migration Lessons learned

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

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?

Single or Multitenancy? VS

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

How to migrate?

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

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

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

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

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

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

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

Archives Calendars Mails Contacts Exchange Online

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

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

OD4B Sites SharePoint Online

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

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

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

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

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)* * https://vanhybrid.com/2017/09/28/summary-of-announcements-for-hybrid-exchange-ignite/

Office 365 Tenant to Tenant Migration - a Complete Survival Guide Stephan Bisser @cloudguy_pro www.cloudguy.pro www.solvion.net