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We are getting ready to test express route and since Essentials is installed on a local server in house, we need to know if there are any ports we need to ensure are open to get to SharePoint Online. Our network folks are asking.

We are getting ready to test express route and since Essentials is installed on a local server in house, we need to know if there are any ports we need to ensure are open to get to SharePoint Online. Our network folks are asking.