Outlook contact CSV import corrupts existing contacts without warning

Hi HatredNamiki, before trying another import, export and back up the current contacts so you have a rollback point. CSV imports are very sensitive to column mapping, encoding, and duplicate handling, even when the CSV originally came from Outlook. I would test with two or three contacts in a separate contacts folder first, manually verify the field mapping, and avoid importing over existing contacts until the mapping is proven. If Outlook is corrupting its own export/import format, that is worth reporting with a sample CSV that has private data removed.