Dutch tax authorities cancel Microsoft 365 cloud rollout, turn to open source

The Netherlands' Tax and Customs Administration has scrapped its planned Microsoft 365 public-cloud rollout after an ICT advisory council recommended reversing it. About 5,000 employees had already migrated; email and calendar will move on-premises in 2027, with European open-source storage and collaboration tools following in 2027–2028.

• About 5,000 employees had already migrated to Microsoft 365 before the reversal
• Email and calendar will run on-premises starting in 2027
• European open-source storage and collaboration tools to follow in 2027–2028
• ICT review cited data confidentiality, encryption and vendor lock-in risks