German IT news outlet Heise reports [German-language article] that the northern most state Schleswig-Holstein has, after half a year of frantic data migration work, successfully migrated their MS Outlook mail and groupware setups to a FOSS solution using Open-Xchange and Thunderbird.

Stakeholders consider the move a major success and milestone to digital sovereignty and saving costs. This move makes the state a pioneer in Germany. As a next major step Schleswig-Holstein plans to migrate their authorities and administrations desktop PCs to Linux.

The state has achieved "digital sovereignty by ditching Microsoft for open source solutions". European nations "have generally been more progressive in adopting open source solutions for government operations."

The migration affected around 30,000 employees across various government departments. This includes the State Chancellery, ministries, judiciary, state police, and other state authorities. Over 40,000 mailboxes containing more than 100 million emails and calendar entries were moved to the new system. The state has adopted Open-Xchange as its email server solution and Thunderbird as the email client...

[Digitization Minister Dirk Schrödter] emphasized that "We are real pioneers. We can't fall back on the experience of others -, there is hardly a comparable project of this magnitude anywhere in the world."

Abstract credit: https://slashdot.org/story/447760/outstanding