Client Mac OSX has failed to install on a Mac running OSX 10.9.1.

Hello,

It is not a very good situation that mail has been archived from 2 of my Mac OSX 10.9.1 users but now they have no way of accessing the archived mail because the Client Mac OSX software reports that it is only compatible with 10.5.4.

The client software was setup by my reseller, so I need to know 2 things :

1. Is there a client version fr Mac OSX 10.9.1.?

2. If no, then how can I restore mail to these 2 users from the archive - they need to access some of their historical mails  

Please advise

Thanks,

David