ORF 4.4 is a minor update with mostly compatibility updates: both Windows Server 2008 and 2008 R2 IIS SMTP-only installations are now supported and also the Exchange 2010 support no longer requires a patch. For the complete list of changes, check the ORF Change Log.

You can download the new version from the Customers Area (or if you are using the trial, you can switch to 4.4 using the trial installer.