Deduplication is emerging as the primary solution to address customers' data growth problems, and is the top initiative for large enterprises. The deduplication market is the fastest segment of the storage industry. Accordingly, every vendor is telling their version of the deduplication story. With emerging technologies, it is difficult for IT managers to determine the true IT benefits vs marketing spin. This paper, sponsored by HP and Intel, discusses several key areas of deduplication and uncovers six challenges customers should understand when evaluating HP or NetApp as their deduplication solution of choice.