Good question. According to the docs your bundles need to be placed in one of the ApplicationPlugin folders on your local drive.
I tried a simple shortcut with the *.bundle extension naming format that pointed to another drive location, but this didn't work for me.
However in Windows 7 (I think for Vista too) you can create a junction link to another folder. I tried this for a bundle located on another drive on my machine and it worked. Maybe you could test to see if this works on your network.
To create a junction link: 1. Open the command prompt as an Administrator. 2. Use the Mklink command, for example: mklink /j "C:\Users\<user name>\AppData\Roaming\Autodesk\ApplicationPlugins\MyApp.bundle" "E\MyAppBundles\MyApp.bundle"