Tenant-to-tenant migration to ensure compliance with data residency requirements

Even complex migrations can be carried out without interrupting business operations — provided they are planned properly
medisana GmbH, a mid-sized company in the medical and wellness products sector, faced the challenge of modernising its established IT landscape while also meeting regulatory data residency requirements. The existing Microsoft 365 tenant was not hosted in a European region, creating increasing compliance, data protection, and governance risks.
RIMERIT planned and delivered a highly complex migration from a non-European Microsoft 365 tenant to a European Microsoft cloud region in order to meet data protection and data sovereignty requirements. As part of the project:
● More than 8 TB of SharePoint data was structured, validated, and securely migrated
● Around 500 Exchange objects — including mailboxes, distribution lists, resources, and rules — were migrated
Thanks to a carefully planned coexistence phase, detailed migration waves, and transparent communication, business operations continued without any noticeable disruption.
To further strengthen the IT environment, RIMERIT implemented two-factor authentication via RADIUS. This significantly enhanced the security of VPN and infrastructure access while also aligning with modern compliance and security best practices — with high user acceptance.