In Microsoft’s Latest Connectivity Guidance, direct internet connections were clearly recommended over ExpressRoute.
You can’t afford to recreate your security stack everywhere, and multifunction appliances aren’t up to the security and bandwidth tasks.
Each Office 365 user connection opens up to 20 persistent connections. Your appliances won’t be able to handle the load or scale with user growth.
Managing the updates and policies across all your appliances will be too complex. Missing one update can cause Office 365 to become inaccessible.
Offices and users directly connect to the Zscaler cloud, and the Zscaler cloud directly peers with the nearest Office 365 data center. Why is this a better deployment?
PEERING WITH OFFICE 365
Peering in most major exchange with 1-2ms round trip time
SCALABLE CLOUD ACCESS CONTROLS
Cloud platform services scale to handle the high number of long-lived connections
Window scaling for faster file downloads
NETWORK PATH OPTIMIZATION
Fast and local DNS and fewer networks hops