What Ports and Whitelists are Needed in a Network to Run the Outlook Desktop Sync?

Objective:

• Outlook Calendar/Contact/Task sync network configuration

Environment:

• Outlook Desktop Sync
• Microsoft Outlook 
• Windows

Additional Information:

When a local network has highly restrictive permissions you may need to whitelist and open certain ports on your network.

Answer:

• Open port 443 or 80
• Whitelist the companionlink.exe process