Steps to Re-Create:
1. Launch email application and configure an Exchange email account
2. From a 2nd system, send a meeting invitation to the 1st user
3. On the 1st system decline the meeting request
4. Check the 2nd system to see if the declined meeting email was received
5. On the 1st system navigate to the Calendar and look for the declined meeting
Please let me know if any solution is there .
Thanks & Regards
Ashish