Issue

Microsoft Outlook 2016 Send/Receive throws following error:

Task ‘Internet Calendar Subscriptions’ reported error (0x80004005) : The operation failed.’

Resolution

The issue was resolved by clearing Internet Calendar subscription settings:

• Close Outlook
• Start > Run
• outlook /cleansharing

NOTE: running above command will remove all RSS, Internet Calendar, and SharePoint subscriptions from Outlook (it does not delete previously downloaded data, only removes subscriptions).

Windows 10 Pro
Microsoft Outlook 2016