Hi, I'm Bhavik. Welcome to JustAnswer. I'm reviewing your question now, and will reply back ASAP.
Please try these steps and let me know how it goes :-
Make sure the Microsoft Outlook application is not open or currently running.
Open the Start menu and click on the "Run" icon.
Type "outlook /cleanreminders" into the dialog box that appears and then hit the "OK" button.
Open the "Run" dialog box again.
Type "outlook /resetfolders" into the box and hit "OK."
Relaunch the Microsoft Outlook program. Your calendar information will now be repaired and recovered
You can press window key+R and then type "outlook /cleanreminders" (without quotes) to do it.
Actually, It does clean the meeting in the background so you would simply see that outlook has opened by itself. Did anything changed after doing that ?
It seems like we do not have any other way to get it back.Unfortunately we have lost it.
Thank you !. Would you like to rate me ? or Do you need any help with refund ?