Exchange 2007 doesn't resolve a username when trying to set up outlook on certain clients

Hi

Always check DNS entry in the Outlook client workstation .

See if the client workstation is using the DHCP correctly in the network adapter. Check all the IPs(Client IP, Gateway IP, and very important DNS IPs)

And the workstation must be part of the domain

In most cases the incorrect DNS is the problem to install a Exchange User(resolving the name or Exchange Server).

If still not resolving, go to DOS console(start menu -> run -> CMD)
then: nslookup "exchange server name" or/and "dns server name"

And see if the name is resolved and you get the IPs. Check that IPs

Try this, then give us the feed back

Jail

Systems are part of the domain and they do resolve the name of the exchange server just fine. I'm sure it's not a DNS issue.

Hi

Have you tested with nslookup?? Have you check the network settings?

Sometimes the problems, is where i think is not the problem.

Double check this, in the Exchange Server, and clients

Jail

Hi

Another issue that sometimes is the issue is the Windows Firewall, just to test, try to disable from the client, and in the Exchange Server(just for test)

Jail

Firewalls have been disabled and still no progress.

Hi

In my last message I answer to the user check the DNS, and the DC to check the Synchronize, so I think if he found that the problem was a replicate, that was on expert answer, or expert direction.

If the user did not give us the feedback from the synchronization, or DCs replicate, we cannot give the right answer. Problem with time synchronize on DCs, is a problem that as many issues. Like users cannot logon, or user changing password, and not been replicate to other DCs, etc. Without any other issues(regardless the Exchange/Outlook), is difficult to know the right problem, and if the user do not give all the information, or feedback, is more difficult.

Many times users use the answer(not the right one, but in the direction of the real problem) to find the right answer, and then do not recognize Experts from that help.

That was one of the reasons that I have been away from this site about a year.

I have write many times, this is not about points, or other issues, is just some recognition from users to Experts help. We are here in our free time, this is not a pay job. We are here to try help other users and give to the IT community  some help.

So if this topic will be deleted, or points refund, I dont care, but I need to write this message.

Thank you for your time

Everything worked according to what you suggested so I didn't think your answer was dead on. As soon as we fixed the time issue, we started getting results.