"I found a forum post (now deleted) which describes a solution for Windows Home Server. There is also another post that covers Running Dropbox as a service on Windows Server 2008. The description below is for WHS.
First, run the Dropbox installer using the command line switch /D=C:\Program Files\Dropbox (with no quotes) to install Dropbox into the Program Files directory for all users.
Then here an updated version of the procedure given on this link:
Since Dropbox will normally only work when a user is logged in, we will have to install and use it first via remote desktop, before it can be turned it into a Service.
Remote desktop to your WHS as administrator Get DropBox from their website. Install and configure Dropbox as you like. e.g. I made a special share on my WHS named Dropbox before the installation and linked Dropbox to this share. Then exit dropbox from the system tray. Similar to Foldershare, you will need instsrv.exe and srvany.exe from the Windows Server 2003 Resource Kit Tools. Copy instsrv.exe to C:\Program Files\Dropbox Copy srvany.exe to C:\Program Files\Dropbox execute ""C:\Program Files\Dropbox\instsrv.exe"" Dropbox ""C:\Program Files\Dropbox\srvany.exe"" execute reg ADD HKLM\SYSTEM\CurrentControlSet\Services\Dropbox\Parameters /v Application /d ""C:\Program Files\Dropbox\Dropbox.exe"" execute reg ADD HKLM\SYSTEM\CurrentControlSet\Services\Dropbox\Parameters /v AppDirectory /d ""C:\Program Files\Dropbox"" Delete or move the shorcut to Dropbox away from the startfolder (Start -> All Programs -> Startup) on the startmenu. Move (cut/paste) ALL the files from C:\Documents and Settings\Administrator\Application Data\DropBox to C:\Documents and Settings\Default User\Application Data\Dropbox execute net start Dropbox"
