DHCP lease and reserversation missing but working after upgrade 2003 DHCP to 2008 or 2012

1.Backup DHCP in DHCP MMC just in case.

2.Open an Administrative CMD shell, export DHCP db with:

netsh dhcp server export C:\dhcp.txt all

3.Delete all Scopes in DHCP MMC

4. Import DHCP db with:

netsh dhcp server import C:\dhcp.txt all

5. Done

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