Migrate your Microsoft 365 tenant globally with no business impact or data loss.

Following a merger, our client needed to transition a subsidiary’s Microsoft 365 tenant encompassing mailboxes, OneDrive, SharePoint, Teams and Azure subscriptions into theirs. Given the contractual deadlines, we had a relatively short timeframe to coordinate the migration, and there were decades worth of data and users in five countries to migrate with zero downtime and data loss.

Challenges

• Timeline - The contractual timeline demanded we migrate everyone very quickly, in a coordinated manner.
• Zero downtime and data loss - The business needed to keep operating, and there could be no loss of data that users had created over the last decade.
• Global Environment - There were users located in the US, France, Italy, Singapore, and the UK. We needed to be conscious of time zones and to phase the work.

The Solution

• We undertook an audit of the entire tenant, including counting every mailbox, site and workload, and to ensure agreement with our stakeholders on the priorities for migration.
• We then used the Quest On Demand Migration tool to migrate the Mailbox, OneDrive, SharePoint, Power Automate, Teams and Azure subscriptions.
• For everything that could use the O365 assessment, we undertook test migrations for these workloads; once we validated the workload was migrated accurately, we then migrated the rest of the workloads.
• Then, to minimize any business disruption, we scheduled the migrations over weekends, with post-migration trailing checking to ensure we caught up with any workloads that remained un-migrated.

The Impact

• Unrestricted scale - There were 595 mailboxes (around 2 TB), OneDrive (~3.6 TB) and 405 SharePoint sites (over 1.65 TB) migrants without downtime and data loss.
• Unified security and compliance: Security and compliance - all users are now under one governance policy as they all exist in one tenant.
• Smooth global transition: Phased migrations across six months ensured users in different countries experienced no disruption.