Is there a limit on the amount of time that MS Outlook Calendar retains past dates and appointment data? I work with users whose past data disappears after about one month. For example, after August passes, Calendar will retain its date and appointment data for August for about 30 days but then it disappears. I can find no setting in Outlook that affects the amount of time that the Calendar retains data. Is this an Exchange setting? I administer an Exchange server for 40 users. Help on this would be appreciated. Thank you.