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For each week beginning on a given date, the figures show the number of sites that reported they are using the mailsystem 6.x-1.13 release.

Mail System project page
mailsystem 6.x-1.13 release page
All Mail System usage statistics
Usage statistics for all projects

Week starting	Count
July 17th, 2016	1
November 29th, 2015	1
May 10th, 2015	1
October 13th, 2013	1

Only Drupal websites using the Update Status module are included in the data. Read more information about how these statistics are calculated.

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Usage statistics for mailsystem 6.x-1.13