What is best way to clean up these lists
Outlook for Mac Contacts (via MS 365 Exchange) do not match iCloud contacts. On iPhone, I can see a large percentage of contacts are linked to both accounts (Exchange and iCloud), but there are many widows and orphans. All Contacts 5489, Exchange 5439, iCloud 588.
Note: I'm still using Legacy Outlook for Mac bc GUI and search features are inferior in New Outlook