Abstract: Techniques for determining ownership of files and/or email messages are disclosed. In one embodiment, the techniques may be realized as a method including determining a distribution of a plurality of email messages within a file; selecting a preset number of email messages based on the determined distribution of the plurality of email messages within the file; extracting metadata from each of the preset number of email messages; classifying each of the preset number of email messages based on the extracted metadata; determining an owner of each of the preset number of email messages based on the classification of each email message by analyzing the metadata of each of the preset number of email messages; calculating statistics for the preset number of email messages based on the determined owner of each of the preset number of email messages; and assigning ownership to the file based on the calculated statistics.