Global Secure Access vs traditional VPN: when AU organisations should switch in 2026

Microsoft Entra Global Secure Access is Microsoft's Security Service Edge (SSE) — the identity-led network access platform that replaces traditional VPNs and adds a Microsoft-traffic-only acceleration layer for M365. For most Australian mid-market organisations, GSA is the most consequential identity product Microsoft has shipped since Conditional Access. The question is not whether to consider it — most tenants will. The question is what it actually replaces, what it doesn't, and when the switch is worth the project cost.

What GSA includes

• Microsoft Traffic — the always-on Microsoft 365 acceleration layer. Routes M365 traffic via Microsoft's network with the GSA client installed. Free for Entra ID P1 tenants in many SKU combinations.
• Internet Access — the secure web gateway. Filtering, web category control, FQDN allow/deny, malware scanning. Paid feature.
• Private Access — the ZTNA component. Replaces traditional VPN by giving users direct, identity-mediated access to internal applications without exposing the corporate network. Paid feature.

What GSA replaces in an AU mid-market tenant

• Cisco AnyConnect, Palo Alto GlobalProtect, Fortinet FortiClient — full-tunnel VPN clients used for remote access to internal apps.
• Cisco Umbrella, Zscaler Internet Access (for the SWG slice) — third-party SWGs deployed independently of the identity stack.
• Zscaler Private Access, Cloudflare Access — competing ZTNA platforms for orgs already running a Zero Trust pattern.

What GSA does not replace

• Site-to-site VPN to AWS/Azure/on-prem datacentres — those are still ExpressRoute, Azure VPN Gateway, or third-party.
• Network firewall — Azure Firewall, Palo Alto VM-Series, FortiGate still own east-west and outbound from datacentre subnets.
• DNS filtering for unmanaged devices — GSA requires the GSA client on the endpoint.

When the switch is worth the project cost

GSA is most worth deploying when: the existing VPN is creaking under modern Microsoft 365 traffic patterns (the all-traffic-through-the-VPN pattern is the worst possible architecture for M365 latency and bandwidth in Australia); the org has Entra ID P1 or P2 already deployed; Conditional Access is in active use and the security team wants Conditional Access policies to extend to network-layer access; the org has any on-prem applications still in use and is paying for VPN concurrent connections.

The 90-day GSA rollout for AU mid-market

1. 1Weeks 1-2 — Acquire licences (Internet Access + Private Access if both are needed), assess Microsoft Traffic-only as a quick win; build the inventory of internal apps for Private Access.
2. 2Weeks 3-4 — Deploy GSA Connectors in the on-prem network for Private Access to internal apps; deploy the GSA client to a 50-user pilot via Intune.
3. 3Weeks 5-6 — Pilot Microsoft Traffic + Private Access for the internal apps with the highest-frequency users (typically finance, HR, line-of-business apps).
4. 4Weeks 7-8 — Pilot Internet Access with a representative web filtering policy (block known bad, audit social media, block uncategorised); tune.
5. 5Weeks 9-10 — Roll out the GSA client to the broader fleet via Intune; turn off legacy VPN client deployment.
6. 6Weeks 11-13 — Decommission legacy VPN concentrator hardware where applicable; transfer remaining users; final security control mapping into Conditional Access.

The AU latency angle

Microsoft Traffic acceleration routes M365 traffic via Microsoft's peering edges. For Australian users accessing M365 endpoints, that means the path is generally Microsoft-to-Microsoft-edge rather than user-via-VPN-to-Sydney-corporate-firewall-then-out-to-Microsoft. The latency difference for Teams calls and SharePoint downloads is meaningful, particularly for users in WA, NT, regional QLD and SA. This alone is often a sufficient business case for Microsoft Traffic-only deployment even before the security argument for Private Access lands.