ActiveSync

 ActiveSync for Exchange 2007

My users are not able to access emails from their smartphones when using with SSL.
. Port 443 is opened on firewall
2. i am using third pary CA(DigiCert) for owa but i am not aware about active sync
3. when i used this command in shell

Get-ActiveSyncVirtualDirectory | fl Server,ExternalUrl
The answer i got is MAIL 
(mail.abc.com) (abc.com is my domain)

please do refer the screenshots and guide me where i am going wrong.

what ports other than 443 should be opened in firewall.