Hi, Chris.

>I have my Web Service published on a computer, a server running IIS. Now when I manage that server (as Administrator or whatever), when I log in - either previous drive mappings are restored, or a login script runs. Consequently I have (say) drive S: mappped to a disk on a computer somewhere else in my LAN.

As Jaime told you, you don't need the mapped letter. You should always use UNC Pathnames (like \\YourOtherServer\YourFolder\Subfolder\).

You have to be sure about giving IUSR_xyz access to this shared folder. That's all.

Hope this helps,