All domains = All domains in Office365 outside your organisation.
Anonymous = All domains outside Office365.
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In the Exchange admin center under Organization and Sharing, I'm looking at the Default Sharing Policy and would like to know what the difference is between using Anonymous and Sharing with all domains. I checked the docs and it didn't seem to explain it. Does anyone know?
All domains = All domains in Office365 outside your organisation.
Anonymous = All domains outside Office365.
https://learn.microsoft.com/en-us/exchange/create-a-sharing-policy-exchange-2013-help
This policy allows users in your Exchange organization to invite users with Internet access to view their calendar availability information by sending them a link
This is versus sharing the calendar directly.