There are actually many sources of unstructured data, which accounts for much of the data growth that we've seen...
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in the enterprise. Estimates dating back to 2003 note that structured data only represented around 15% of all the data we use on a daily basis, and everything else is considered unstructured.
Right now, your most significant sources of unstructured data are email and file services; both are generating a lot of data. Remember, file services doesn't just include spreadsheets and Word documents. We're talking about video files, audio files and image files -- rich data that is very difficult to control. With email, consider how we "Reply to All" and forward messages that duplicate and proliferate a message many times over -- often with attachments. Ultimately, the unstructured data is really piling up and cluttering our file servers and other infrastructure.
Listen to the Unstructured data FAQ audiocast.