I will show you how Exchange Administrator can share user calendar direct from Exchange Server. In my case, i want share my outlook calendar with Michael and grant permission to him as a Editor.

  1. Open Exchange Powershell by clicking on Start Menu > Microsoft Server Exchange 2010 > Exchange Management Shell
  2. Now, run this command :Add-MailboxFolderPermission -Identity userid:\calendar -User michael -AccessRights Editor
  3. Done

Example :