Alain, I could not help but notice your post included the following:
"Really Sogo is THE RESPONSE against exchange and THANKS GUYS FOR YOUR WORK.I participated to Kolab development i m the creator of the backend Kolab for Zpush" There are a lot of admins out there interested in providing ActiveSync Emulation to their users. It seems that the Zpush fork Php-Push2 might be the best solution for this protocol with SOGo, but contacts don't seem to work. (https://github.com/dupondje/PHP-Push-2) Would you be interested in helping solve this problem? Mark -- users@sogo.nu https://inverse.ca/sogo/lists