Proxy OnPrem: Microsoft Office 365 handling recommendation [2025]

[PPro]

Hello all,

are there any updated [2025] recommendation for M365 handling with on-prem proxy? Is the document "ProxySG/SGOS/On-Premises Office 365 Best Practices" deprecated?

here is a list of available documentation:
Office 365: Network Security and Performance Simplified White Paper - 2022

Office 365: Network Security and Performance Simplified White Paper - Cloud SWG/WSS
Symantec Web Security Service: Office 365 - 2020 (5 years old)
Office 365 integration in Cloud SWG (formerly known as WSS) - 2023

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