You create a Visit in C4C with Account as mandatory field but in Microsoft Outlook this does not happen
Reproducing the Issue
1) Create a Visit in Microsoft Outlook
2) Notice that maintaned mandatory fields in C4C does not apply to Outlook
3) Sync Visits from Outlook to C4C
4) Notice this affecting queries such as My Visits in C4C (if Account is mandatory and Visits are reaching C4C after sync without an owner)
C4C has possibilities of sync with Microsoft Outlook indeed but this is limited to some fields of certain features such as Visits. C4C cannot change the bulk code of a third party software such as Microsoft Outlook to change its core logic or labels in its screens. C4C cannot change mandatory fields at all in scenarios like this one.
This is the standard system behavior.
KBA , LOD-CRM-EMP , Employee , How To