BUZZ-Canada's AlarmForce set for worst day in 7 yrs on accounting review
** AlarmForce's shares drop 7.3 pct to C$10.47, set for their worst day since January 2009
** The provider of security alarm monitoring services says it is reviewing revenue recognition policies since Q4 2013 for incorrect revenue generated after customers' cancellation request
** Company found it incorrectly charged monitoring fees subsequent to a cancellation and says retroactive to Aug 2013, it will refund customers who have been overcharged
** AlarmForce says review to delay filing of Q3 report, expects to also record charges of C$0.7 mln related to receipt and review of unsolicited buyout offers
** More than 30,000 shares traded, about 5x the stock's 30-day moving average
** Up to Tuesday close, stock had risen nearly 9 pct this year
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