3368172 - Appointments Created On C4C Disappear From Outlook Calendar after 30 days (Groupware)

You have created an appointment on C4C and have synchronized it using the groupware add-in to your Outlook.
However, after 30 days you realized that the appointment is missing from Outlook but is still appearing on C4C.

SAP Cloud for Customer

1. Create an appointment on C4C.
2. Synchronized it with your Outlook with groupware.
3. After 30 days, the appointment disappears from the Outlook calendar.

This event was originated from C4C, therefore this is expected behavior when they fall out of the sync scope.
You can check related information on following article: SSI Synchronization

This is the system expected behavior.

KBA , LOD-CRM-GW-SCC , Invisible CRM - Smart Cloud Connect Solution , How To

SAP Cloud for Customer add-ins all versions ; SAP Cloud for Customer core applications 2305