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The Boston Globe reports that hackers early last week took down the servers of MJ Freeway, a system that tracks marijuana sales and inventory, and helps dispensaries prepare regulatory paperwork. The company says no customer or patient information was stolen during the attack, but large amounts of data was corrupted. The recovery process has been slow, and at least some customers are abandoning the company.

With their sales systems down, dispensaries have spent the last week struggling to keep things flowing smoothly. One medical nonprofit, New England Treatment Access (NETA), notified clients in the days after the attack that sales would be slower than usual because staff would have to execute them manually. Other outlets, according to Marijuana Business Daily, were forced to close temporarily.

According to a video statement issued yesterday by MJ Freeway CEO Amy Poinsett, the attack took out both MJ Freeway’s production and backup servers, in what she described as an “unprecedented malicious attack.” While the damage from the attack was severe, Poinsett said “much is reparable.” [Read more at Fortune]