Thomas.Poett@TEAMS (MVP Teams and Cross-Tenant Migration Specialist)

Dedicated White Paper to Microsoft TEAMS CROSS-TENANT Migration. The guide includes Teams Team/Channels, private/ personal chat and Enterprise Voice  (Direct Routing) migration explanation and recommendations. It is written for decision maker, project manager and solution architects. Download @ SlideShare  https://www.slideshare.net/thomaspoett/cross-tenant-migration-microsoft-teams

  Cross-tenant Shared DNS Space (Native Cross-Tenant Domain Sharing for Exchange Online)   Upcoming new features, describe and change migration approach, (private preview) Reference: Supporting Mergers, Acquisitions, and Divestitures in Microsoft 365 - Microsoft Community Hub   Microsoft has announced publicly a new expected solution architecture and some of the configuration and management tasks you must perform when utilizing native cross-tenant domain sharing functionality. Below, the step-by-step description to enable cross-tenant domain sharing for a single SMTP domain. (valid as long no major changes are introduced by MS) The domain will be Authoritative in the Tenant where you perform the primary domain management. Up on enablement for domain for cross-tenant domain sharing, you will be able to add the domain as an Internal Relay in additional tenants. An internal Relays is like in Exchange On-Premises relay configuration.     Cro...

  Personal Chat Migration into Azure Data Lake   Another approach, rudimentary described in the white paper is, migration or better said exporting Teams chat messages into Azure Data Lake solution.   To be said upfront, this is not a solution you or a consultancy company can do, rather you must engage Microsoft (MCS/PSS). This is an internal Microsoft solution using a private API for export.   There are several options on how data can be extracted: -           Single large XML file -           Individual XML files per Teams user There is no other way yet, rather than using XML. Further, you must purchase an Azure VM and Azure Storage. The costs aren’t too high and acceptable. After Chat message extraction, the consolidated XML file will be sent via email or copied into OneDrive.   Talking about user experience. This is not a user-friendly option! As u...

  Cross Tenant User Migration Approach and considerations In any Tenant 2 Tenant migration the migration approach you have to consider based on: ·        Migration Tools ·        Communication/ Work clusters ·        User and shared data The combination and dependencies of the above will guide you to the best possible decision, how you migrated a tenant and merge it into the target environment. Migration of data is time consuming. We explained the tenant limitation (throttling) in a chapter above. Nevertheless, pre-loading of data into the target tenant is crucial including the sequence required for planning.   Migration Tools There are multiple vendors on the market providing tools, tool sets. They either run on-premises, in Azure or have developed their own cloud-based solution. Principally you will consider a mix of different tools and vendor. Most companies run a h...

  Meeting Link Migration for Teams Note: both, first user Mailbox/Calendar and Teams must be migrated A 3 rd party tool is required to accomplish a meeting link migration. With Exchange Mailbox migration, all items, including calendar item will be migrated as they are. Calendar item with a link to a Microsoft Team meeting link back to the original Team meeting in the source tenant. The URL is retained. A Teams Channel meeting is not recreated in the target tenant. Those meetings must be rescheduled manually by the channel owner.   How it works (e.g. Quest): The meeting link migration task will create a new Team meeting with the original meeting details in the target tenant. It will set the target user as the organizer. The original meeting migrated to the target will be canceled. The cancellation will be automatically sent out to the organizer and recipients. Meeting Link Migration Considerations Before migrating Teams meetings and their respective link, be awa...

  Example of our user data migration approach: Important is the completion of your data pre-load for OneDrive and Exchange. Remember, that the pre-load should include as much data as possible. Syncing on the cut-over day data > 10 GB or more than 500 files in OneDrive, might end up with an INCOMPLETE set of data in the target. Therefore, you should urge using the OneDrive Cross-tenant OneDrive Migration tool from Microsoft. The user will than see data being migrated (missing data) upon he starts working in the target environment. This will not be happening with the cross-tenant migration tool. The switch to the target tenant will take approx. 15min. Migration of Teams personal Chat messages, we mostly limit to 15 days. The performance is acceptable migrating approx. 400 – 800 users/day. Note: You should have special procedures in place for legal-hold users, white glove and user object facing issues. Prepare source and target tenant and ensure the readiness for Microsoft...

  Personal Data migration Exchange and OneDrive In the previous chapters, it is stated: Teams make use of several M365 service. Especially for the personal side of Teams, Exchange and OneDrive are heavily involved. Towards Teams migration, it is required, that ALL data is present in the target environment for Exchange Calendar and OneDrive (shared files).   Data Pre-Load Data pre-load is much slow than you expected. This is the most important lesson learned. While Exchange is faster than OneDrive, be aware of the time required for the data copying process. Another important statement is: none of the existing solutions are SYNC solutions, data is only copied. Therefore, a co-existence and working parallel in both, source and target tenant can lead to data inconsistence. If data is changed in the target environment and in source, any delta sync will overwrite the target data, if source has a new change date. Same, if the target data is newer, changed source data wi...