Hi Barb,
Importing records in Adagio has an option called 'Allow extended character set' (or something like this) that has to do with ASCII characters such as French characters with accents. When you are exporting and importing, do you have this option enabled?
Also, ensure that after customers are exported, the characters are correct so that importing has a chance. Though there should not be a difference, perhaps exporting to Excel behaves differently than say to the CSV format.
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Regards,
Softrak Tech Support