Exchange 2007 Certificate errors

[alekso1234]

Hello,

We got a company, running SBS 2008. Internal domain is .local

Purchased 3rd party certificate from StartCom,with primary use for OWA.Registered public domain for email .org

Users connect to their mailboxes, using: Microsoft Exchange Accounts, and some of them POP/IMAP.

Those who are connecting with Microsoft Exchange Accounts have no issue at all.

Those who are connecting with POP/IMAP(TLS Encryption for Outgoing Server-port 587) accounts have issues("The name of the security certificate is invalid or does not match the name of the site")

Solution for POP/IMAP was enabling POP/IMAP services to Public cert.I Run Enable-ExchangeCertificate -Thumbrint XXXXXXXXXXXX -Services IMAP,POP.

Certificate error is corrected for POP/IMAP, but now Exchange Accounts experienced certificate error("The name of the security certificate is invalid or does not match the name of the site"-it's pop public cert now)

When i ran: Get-ExchangeCertificate i see following services assigned to certs(attached picture):

Self-signed(created during setup): SMTP
Public Cert(StartCom SSL): IMAP,POP,OWA,SMTP

After hours of googling,I get the point that something with SMTP service isn't right, and decide to Export public cert, and import again.After that, Get-ExchangeCertificate:

Self-signed(created during setup): SMTP
Public Cert(StartCom SSL): IMAP,POP,OWA

Self-signed cert seems to be like before I made any changes

but now Exchange Accounts got cert error too("The name of the security certificate is invalid or does not match the name of the site"-it's pop public cert now")

Whole week i try to resolve this, but still problem continues.

Any suggestions and directions?

Regards,