Just a few comments from me. Since hMailServer 4.0, the installation do not have to write to C:\Windows\hMailServer.ini any more. In previous versions, the file hMailServer.ini (that pointed out what database to use and directory information) was stored here. But in 4.0 (and of-course any future version), hMailServer.ini is stored in the Bin directory, (normally C:\Program Files\hMailServer\Bin). But there are still some COM objects that are needed by the installation, and hMailServer must run as a service to run properly. If the COM objects aren registered, hMailAdmin won't work. And without hMailAdmin, you cant add/edit/delete domains/accounts which makes it a bit unusable.. Would be nice to hear what would be needed for it to be considered "mobile"? No service registration and no need for COM registration?