You have implemented the Server Side Integration for Outlook and noticed new Categories.
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SAP Cloud for Customer
The categories are used to mark the relevant data to be synched from Outlook to Cloud for Customer (C4C). Transactional data is synched only if marked as relevant for C4C via outlook categories or for the cases where autosynch applies. If you create an appointment or task, you can categorize it as relevant for C4C and as a result it is replicated to C4C via an asynchronous web service call.
This is a standard behavior of the system. It's highly undesired to remove those categories, as it will lead to inconsistency of synchronized data. Even if user removes them manually, categories are going to be restored while the consequent synchronization.
Outlook, server side integration, categories , KBA , LOD-CRM-GW-SCC , Invisible CRM - Smart Cloud Connect Solution , Problem