I have seen a document about outlook calendar related to out of office, but I am not sure exactly its purpose, I will try to explain how it is set up:
-open a new appointment
-enter the subject , for example :my name -out of office - vacation
-enter start/end time
-Show as :Free
in scheduling assistant, add invitees and send invitations
after sending invitations, change: Show as to Busy and set reminder to whatever preferred.
Save changes,but do not resend to your invitees.
Any Outlook expert to explain the purpose of these settings?