This policy setting controls whether Outlook 2007 can automatically upload calendar updates to Microsoft Office Online.
If you enable this policy setting, Outlook 2007 enforces the "Single Upload: Updates will not be uploaded from the Published Calendar Settings dialog" option, and calendar updates are not uploaded. Users will not be able to change this setting.
If you disable this policy setting Outlook 2007 automatically publishes calendar updates to Microsoft Office Online at regular intervals and users will not be able to change this.
If you do not configure this policy setting, when users publish their calendar to Microsoft Office Online using the Microsoft Office Outlook Calendar Sharing Service, Outlook 2007 updates the calendars online at regular intervals unless they click "Advanced" and select "Single Upload: Updates will not be uploaded from the Published Calendar Settings dialog".