Is there any command through which I can export events/appointments for all the users of the org ?

Likely yes, but you'd be better off asking this in the appropriate Exchange forum for your version.

https://social.technet.microsoft.com/Forums/en-us/home?category=exchangeserver%2Cexchangeserverlegacy&filter=alltypes&sort=lastpostdesc

Hi GoodCoder,

Agree with Mike, Please post in the dedicated forum for more more efficient support.

If you have problems to run powershell script, please post current script and issue.

In addition, please refer to EWS Managed API in Exchange to list the Canlendar and Appointment information:

https://social.msdn.microsoft.com/Forums/office/en-US/e8af16ac-845d-4afb-a14a-3c373a80e932/how-to-export-calendar-items-to-csvfile-with-powershell?forum=exchangesvrdevelopment

http://gsexdev.blogspot.com/2009/11/basic-powershell-script-to-show.html

https://unlockpowershell.wordpress.com/2010/09/14/powershell-ews-managed-api-get-calendar-booked-time/

If there is anything else regarding this issue, please feel free to post back.

Best Regards,

Anna Wang