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Error “No free/busy information could be retrieved” for one user

We try to add “User1” to a meeting request in OWA/Outlook 2010 but couldn’t view his free busy information. It errors stating “No information could be retrieved”. Everyone getting same error for User1 but User1 can view his free/busy from Outlook.

Test-OutlookWebservices was success. Autodiscover working fine and can set Out of Office.

Solution:

Since the issue is for one particular user, check for the calendar permission of the user by running following command:

Get-MailboxFolerPermission -Identity User:\calendar | FL

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If the default permission is set to none, change it using the following command:

Set-MailboxFolderPermission -Identity User:\calendar -User Default -AccessRights AvailabilityOnly

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