Hello,
I have Win 2008 server running DHCP, with client lease time as 2hrs.
We have recently updated our clients from win 7 to Win 8 (not sure if this is the cause) (apprx 60-70),
also some mobile connected via wireless.
DHCP don't seems to be releasing IP's as it should.
As I have go in DHCP remove IP manually and then it would start assigning till scope gets full again
in few days.