As you suspect, it’s for farm machines. We’re using TeamCity and GitLab for various operations, and getting a Windows service to create network drive mounts is painful at best and a security nightmare at worst. It’s likely more of an issue with our enterprise networking and security model than anything else, but if -vfs means the drive letter doesn’t have to exist in the service user space it’s certainly worth a shot. Are there any docs on this, or is it best to go code spelunking in UBT source?