The Bridge Between
Your Office and the Cloud
Microsoft Entra Connect is the infrastructure that silently keeps your on-premises Active Directory and Microsoft’s cloud in perfect harmony — so your users never have to think about identity twice.
The Identity Bridge, Explained
Microsoft Entra Connect — formerly known as Azure AD Connect — is the tool Microsoft built to connect your on-premises Active Directory environment with Microsoft Entra ID in the cloud.
If your organization runs a traditional Windows Server domain on-premises and uses Microsoft 365 or Azure, this tool is what keeps both systems in sync — so users manage one identity, not two.
Why Does It Exist?
In the early days of cloud adoption, companies faced a “split-brain” identity problem: users had one password for their office PC and a completely different one for their cloud email. This was a nightmare for both security teams and end users.
Entra Connect was created to eliminate that problem entirely. It solves three specific, recurring pain points:
The Core Building Blocks
Entra Connect isn’t a single script — it’s a suite of components working in concert. Understanding each piece helps you diagnose issues faster and plan deployments with confidence.
Think of Entra Connect as a silent postal service running 24/7 between your office and Microsoft’s cloud — constantly checking for changes, syncing updates, and keeping every identity perfectly in step across both worlds.
Entra Connect vs. Cloud Sync
Microsoft has been progressively introducing Microsoft Entra Cloud Sync — a lighter, cloud-native alternative. Understanding the distinction is now essential for any hybrid identity architect.
| Feature | Entra Connect (Classic) | Cloud Sync (Modern) |
|---|---|---|
| Agent Model | Heavy server-side installation | Lightweight cloud agent |
| Sync Logic Location | Runs on your local server | Runs in Microsoft cloud |
| Custom Sync Rules | ✅ Full support | ⚠️ Limited |
| Multi-Forest Support | ✅ Complex topologies | ✅ Disconnected forests |
| Writeback Features | ✅ Full (PW, Group, Device) | ⚠️ Partial |
| High Availability | Staging mode (manual) | ✅ Multiple agents, native |
| Best For | Complex configs & large enterprises | Simpler setups & cloud-first orgs |
For most large enterprises with custom sync rules, writeback requirements, and complex multi-forest topologies — Entra Connect remains the right tool. Cloud Sync excels in simpler, cloud-first environments where infrastructure simplicity is prioritized over configurability.