End of Exchange Support in 2025: What Organizations Must Do Now to Protect Their Data
Background: Microsoft Ends Exchange Support – Tens of Thousands of Systems Affected
As of October 14, 2025, Microsoft no longer provides free security updates for Exchange Server 2016 and 2019. According to an analysis by Germany’s Federal Office for Information Security (BSI), around 33,000 outdated Exchange systems are still active in Germany alone—many of them in enterprises, public institutions, and healthcare organizations.
These servers pose a significant security risk, especially if they remain accessible from the internet.
What Does This Mean for Your IT Security?
Attack Vector for Automated Exploits
- Exchange servers remain attractive targets for ransomware, credential theft, and data exfiltration.
- New vulnerabilities are no longer patched, and even zero-day exploits remain unaddressed unless organizations subscribe to the paid “Security Updates” program, which itself ends in April 2026.
Compliance and Liability Risks
- Operating outdated systems violates fundamental security principles (Art. 32 GDPR).
- Data breaches can result in fines, cyber insurance exclusions, and liability risks for management.
Unpredictable Operational Outages
- Data loss, system downtime, and high recovery costs strain IT and business resources.
- Incidents harm customer trust and damage corporate reputation.
What Organizations Should Do Now: Your Options at a Glance
Option 1: Securing Outdated Systems
Organizations that cannot migrate yet—due to technical, regulatory, or budget constraints—should at least implement short-term protection measures:
- No public exposure to the internet
- Access only via VPN, IP whitelisting, or reverse proxy
- Network segmentation of Exchange servers
- Daily backups and anomaly monitoring
Option 2: Migration or Upgrade
- Switch to the Exchange Subscription Edition (available only in hybrid deployments)
- Migrate to Microsoft 365 or other SaaS platforms
- Ensure data protection through encryption with eperi sEcure
What eperi sEcure Delivers in Practice
| Feature | Description |
|---|---|
| Encryption before the Application | Data is encrypted within your infrastructure before reaching Exchange Online or other applications. |
| No Cleartext on the Server | Microsoft never sees readable data—even in case of unauthorized access. |
| Full Key Ownership | Keys remain entirely under your control, with no access for third parties or authorities. |
| Compliance | Supports adherence to German data protection standards such as GDPR as well as industry regulations like DORA or NIS-2. |
| Full Functional Use | Emails, calendars, and contacts remain fully usable despite encryption. |
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Why eperi sEcure Matters Now More Than Ever
- Provides reliable protection during cloud migration
- Increases overall security—independent of software lifecycle
- Ensures compliance for audits and regulatory bodies
Conclusion: Secure Your Systems Before Attackers Act
The end of support for Exchange 2016/2019 affects tens of thousands of organizations, many of which lack a migration plan. With eperi sEcure, cloud migration becomes a secure and compliant option.
eperi sEcure offers a technically ready-to-use solution that protects your sensitive data immediately.
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