SharePoint is where collaboration lives. TeamSync is where the regulated records-of-record story belongs. The 2 are not in opposition — they're in different roles.
The replace-SharePoint pitch is wrong. SharePoint is where the workforce collaborates and that's working. The right framing is different: SharePoint is the collaboration surface; TeamSync is the records-of-record platform underneath, federating from SharePoint without forcing the collaboration off it.
This page is honest about where the 2 products belong, where the M365-only path falls short for regulated estates, and what the coexistence pattern actually looks like.
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Where SharePoint + M365 is the right answer.
There are situations where the M365-only path is the right architecture.
| If your situation is | M365-only is probably the right answer |
|---|---|
| Your regulated content footprint is genuinely small (under a few 100 GB of records-of-record) | The M365-resident features may be enough |
| Your regulator's evidence requirements can be satisfied by Microsoft Purview's audit | Don't add a layer you don't need |
| You don't have material records-of-record outside M365 (legacy DMSes, LOB systems, vertical applications) | The federation argument doesn't apply to you |
| Your AI scope is M365-resident and Copilot's grounding model is acceptable | The M365 + Copilot path is sufficient |
Most regulated organisations don't fit this profile. If you do, stay on M365.
Where TeamSync is the right answer.
The conversation tilts the other way when:
| If your situation is | TeamSync is the more defensible answer |
|---|---|
| Records-of-record live across SharePoint, the legacy DMS, the LOB systems, the supplier portals | Cross-source federation is what TeamSync was built for |
| The CISO needs cryptographically-anchored audit, third-party verifiable | Purview's audit is comprehensive but not cryptographic |
| AI needs to reach beyond M365 into the legacy DMSes, the LOB systems, the regulated estate | Copilot's cross-source story is partial |
| GDPR Article 17 requires cryptographic right-to-erasure | Purview's deletion is procedural; backup-tape recovery risk is real |
| The eDiscovery scope is broader than M365 | Purview eDiscovery's cross-source story is limited |
| The regulator's overlay isn't well-served by Purview's compliance manager | The TeamSync overlay catalogue is structurally separate |
Dimension-by-dimension comparison.
| Dimension | SharePoint + M365 (with Purview, Copilot) | TeamSync |
|---|---|---|
| In-M365 collaboration | Best in class | Coexists; TeamSync doesn't replace this |
| Records-of-record across sources | M365-resident only; cross-source story is partial | Federated across the regulated estate |
| Cryptographic audit | Comprehensive log; not third-party verifiable | Merkle hash chain with external anchoring |
| AI grounding scope | M365-resident; cross-source via connectors | Native across the federated estate |
| Permissions-aware AI | Strong inside M365; cross-source enforcement varies | Native; query-time permission check |
| Citation grounding depth | Source-document level | Span-level, with click-through |
| Crypto-shred / right-to-erasure | Procedural; backup-tape recovery risk | Cryptographic; per-tenant envelope encryption |
| eDiscovery scope | M365-resident strong; cross-source limited | Cross-source native; preservation in place |
| Compliance overlay model | Purview compliance manager | platform-level overlay catalogue |
| Vendor-cohesion | Strong inside M365 | Single platform, single roadmap |
The realistic coexistence pattern.
This is the coexistence story most regulated organisations actually arrive at.
| Surface | Where it lives | Why |
|---|---|---|
| Workforce collaboration | M365 / SharePoint | The workforce already uses it; don't disrupt |
| Records-of-record | TeamSync, federating from M365 | The regulated estate needs cross-source coverage |
| AI grounding | TeamSync, reading from federated sources | Cross-source coverage and audit defensibility |
| Cryptographic audit | TeamSync platform | The Merkle chain story Purview doesn't tell |
| Right-to-erasure | TeamSync (cryptographic) | The proof-of-destruction story Purview doesn't tell |
| eDiscovery | TeamSync (cross-source) or Purview (M365-only) | Depends on scope |
The coexistence is structural. M365 keeps doing what it does well. TeamSync owns the surfaces where M365's M365-centric architecture is the constraint.
How customers describe the choice.
The pattern we hear from CIOs who've been through this evaluation:
"We didn't want to replace M365 — we wanted to put a records-of-record platform underneath it that worked across all our content, not just the M365-resident content. TeamSync federates from M365 without disrupting the workforce, and gives us the cryptographic audit and cross-source AI we couldn't get from M365 alone."
That's the architectural pattern. M365 is not the enemy. M365-only is the constraint.
Read further.
- Why TeamSync — consolidate document sprawl — the architectural pillar
- Why TeamSync — permissions-aware AI — the AI defensibility argument
- Why TeamSync — tamper-evident audit — the audit chain Purview doesn't deliver
- CFO page — the financial case
- TeamSync vs M365 Copilot — the AI-specific comparison