I just had the same issue with my 08 Ford Edge Limited.  I was wondering who you sent your email to?  I want to send a similar one in hopes that they address this problem.  The service department manager at my Ford dealership said the motor issue is a result of Ford buying the initial motors for the vista roof from one company and then switching to a new company.  Because of this, the motors cannot be purchased as a single unit.  So even if only one motor was the issue, you have to buy both new because the new motors aren't compatible with the old ones.