Search for files doesn't search mountpoints

OS: Vista x64 Ent ENG, SP1

I use mountpoints on my computer to manage my USB-disks.
When i try a search from within Windows Explorer the search result doesn't
return any findings located on any of the mounted volumes

==> Please fix! :-)

Example:
C:\ (System Partition on internal disk)
D:\ (Partition on computers internal disk)
D:\Docs (Directory on the partition D
D:\Mountpoints\USB1 (Mounted volume on USB disk 1)
D:\Mountpoints\USB2 (Mounted volume on USB disk 2)
D:\Mountpoints\USB2\Docs (Directory containing documents on the mountet
volume)
D:\Mountpoints\USBx (Mounted volume on USB disk 3)

So, if I want to search for documents (.DOC) and start a search from D:\ the
result will only return files from the D: - drive itself. If I try a search
from D:\MOUNTPOINTS\USB2 I do get the .DOC files from that volume




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