A method for determining mail archive ownership during data migration is described. The method is performed by a Migration Manager that is capable of generating a list of possible owners based on confidence level. The confidence level is obtained by scanning various messages associated with the mail archive and determining a frequency of appearance a particular user name (e.g., e-mail address) appears compared to the total number of messages scanned. The generated list of possible owners can subsequently be used to determine/confirm the owner of the mail archive. Confirmation may be required before the data migration is completed.