Windows leases through a PC reset

[SCOTT BURGIN]

Basic question - RFC aside - does anyone have real world knowledge (personally conducted testing preferred) of whether a Windows machine will continue to use a valid ISC provided lease through a power down/power up sequence when the DHCP server(s) are unreachable ?  Does the version of the Windows OS change the result ?

It is being challenged in our environment that the Windows machine *wlll not* continue to use the still valid lease through a power down/up sequence if it can't reach the DHCP server.