Public Folder Certificate Problem

[Xelitus]

I'm running OWA with SSL enabled using a ChainedSSL certificate from freessl.com which works great.

My problem is when I'm attemping to access public folders through the Exchange Manager I keep getting the following error:

The certificate chain was issued by an untrusted authority.

ID no: 80090325
Exchange System Manager

I've attempted to reinstall the certificate manually by double clicking on the certificate, clicking install, then browsing to a specific physical store (Trusted Root Certification Authorities/Local Computer) but this doesn't seem to help and I've attempted to restart Exchange/IIS without success.

Any thoughts?

-Brad