Your Office 365 admin should not be your archive admin. A third-party solution stores a separate, immutable copy of every email and file outside the direct control of the Microsoft 365 environment. This prevents an internal admin from covering tracks.
Third-party archives create tamper-proof audit logs of every search, export, and deletion request. Many also include digital signatures (hash values) per document to prove integrity over decades. Recommended Third-Party Solutions for German Compliance If you need GoBD, IDW PS 880, or GDPdU compliance, consider these established tools:
Before your next tax audit or legal discovery request, ask your compliance officer: "If our global admin left today, could they delete last year’s contracts permanently?" If the answer is "maybe," you need a revision-proof archive. Disclaimer: This post provides general guidance. Always consult with a certified data protection officer (DPO) or legal counsel regarding specific GoBD, GDPR, or local regulatory requirements.