Exchange 2013 certificate

Hi All

Gotten a SSL certificate from a provider, but the provider mention that they no longer allow (.local) domain to be added in the certificate.
Because of this , all users when open outlook will prompt a error saying certificate mismatch. Have most of the internal URL to mail.domain.com accept for autodiscover URL. Currently is using Exchange 2013 with Microsoft Server 2012 Standard.

Thanks in advance