With Windows 2008 SP2 and 2008 R2 the following PCIe ExpressModules cannot be hot-plugged:
Fibre Channel - 4 Gigabit/Sec PCI-X Dual FC Host Adapter (Emulex)
Sun Quad Gigabit Ethernet Module (X7284A-Z)
The affected Windows platforms include:
Windows Server 2008 Service Pack 2
Windows Server 2008 R2