This is a quick and dirty way of retrieving the self-signed SSL certificate that Exchange 2007 servers use out of the box.  Get-ExchangeCertificate only works locally on the box that has the certificate…not fun when you have a long list to find out so you can build a list for renewing them.  This uses psexec to connect to the remote server and retrieve any personal certificates and display the expiration date.  Short and sweet.