- Sign in to the Office 365 portal (https://portal.office.com), and then click Outlook to open Outlook Web App.
- In Office 365, click Settings ( ), and then click Options.
- Click Settings, and then click Calendar.
- Under Automatic Processing, click to select the Automatically process requests and responses from external senders check box.
- Click Save.
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Article ID: 2729553 - Last Review: Dec 16, 2016 - Revision: 1