Create a meeting request, for example for your next meeting or a planned phone call. Look for free times in the calendars of the participating colleagues.
Ask a colleague to send you a meeting request, look up the time in your calendar, and accept it or propose a different time.
Check your meetings for the next month: Which ones can you group into one, cancel, or replace with a conference call or a Live Meeting? Act accordingly.
Together with your team, agree on core times for meetings, come up with a fixed meaning for the Out Of Office status, and look for ways to optimize meetings in the future (such as maximum duration time, agenda, or meeting workspace).
Enter your vacations as all-day appointments and as (Show As) Out Of Office. For ...