The problem is that if I make all workstation first DNS go to DHCP server then everyone can logon but then their outlook takes forever to open. Every workstation gets their IP address automatically.
The DHCP server which is also a DC where users authenticate to is a windows 2000 server and then two DNS they get on their workstation is the 192.168.100.40 and also 192.168.100.48
Now if the first DNS that all workstation get is 192.168.100.40 then the machines login without much delay. But then outlook does not work right away and take almost 20 minutes to connect to the exchange server which is on a separate DC which is a windows 2003 server and its IP address is 192.168.100.48
If I change the DNS order that each workstation gets to 192.168.100.48 then each machine takes 20 minutes to login but outlook works great.
We have been running these server without any issues for almost three years. But all of a sudden after we got new DNS numbers from ISP and adding them to the DNS server on the 192.168.100.40 has caused issues.
Can anyone help. Microsoft has no solution and they are still researching. They had me change the order but then no one can login and it takes forever.