Hi Mike,
Before going further, could you please clarify what exact problem you have encountered when importing the .csv files then we can help you better?
Are there any steps to reproduce the issue?
Is there any error message?
Generally, we can download and open a sample .csv file for importing contacts to Outlook:
Create or edit .csv files to import into Outlook
Please check the article below to see if it can be helpful and feel free to post back with more details if you still further assistance on this issue.
Regards,
Yuki Sun
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