Outlook busy time not updating

The thing is, the user can see anyone free/busy through the OWA. Finally, I found the answer for my problem with Free/Busy Scheduling in Outlook 2010 Calendar.

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This gives people more information about what you’re up to.Your presence information is a quick way for other people to see your availability status.Presence is automatically set based on your Outlook calendar, but you can change it manually if you want to.If you're using our 2-way syncing for Office 365, or Exchange be sure the box to "block off time in Acuity from ..." is checked: If you've already got blocking enabled, check the "Free" vs. We'll only block off time in Acuity from events which are "Busy" in Outlook.If the event is new, it takes up to 6 or 7 minutes for Outlook to let us know a new event has been created before were able to add it to Acuity.