We are migrating from Exchange 2007 to Exchange 2013 and are having a problem with the smartphones and tablets syncing e-mail. We have moved the users' mailboxes over to the E2013 server. We have moved the pointers in the firewall to point to the new server. OWA is working fine over port 443. There are now certificate errors. The activesyncvirtualdirectory is pointing to mail.contoso.local and the DNS entry for mail.contoso.local is pointed to the E2013 server.
Smartphones with existing accounts are not able to send or receive mail.
When we try to setup a new account on a smartphone the account sets up fine but then there is an error when it tries to sync messages.
Thanks for any ideas.