Ever so often, when a hardware device fails or gets replaced by another, the old one still slumbers in the deep abyss that is Windows. Usually, this is not really a problem as the unused device only takes up disk space in the form of drivers and/or support software.
In case of network equipment, that's another story. Setting a static IP on a network adapter, replacing it with another, then setting the same static address on the replacement invokes a confusing warning message. In case of 2008 SBS, it gets even worse as running certain wizards will barf out errors about not being the primary ada  ...