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Why Outlook 2003 is unable to connect to Exchange 2003?

Origin: single network single domain (Windows 2003):
default gateway: 10.0.1.1
svr-dc-dns1: 10.0.1.11
svr-dc-dns2: 10.0.1.12
svr-exch: 10.0.1.13; dns = 10.0.1.11/12
workstations use dhcp.
all servers and workstations are in the same network.
No issues noticed.

Changes made:
segment workstations from servers as follow:
servers stay the same
workstations are put in 10.0.2.0/24 network
use dhcp to dispatch ip (10.0.2.x) and dns (10.0.1.11/12);
workstations are able to ping servers by ip and host name;
There are no dc in 10.0.2.x network.

Issues noticed so far (6 days since change):
A few users are not able to open Outlook properly. When setting up the user's Outlook profile again, Outlook says 'The name could not be matched to a ame in the address list'. When trying to set up another user, Outlook is unable to resolve the mailbox even though the mailbox is there.

Q#1. Is the above issue related to the above network change? If yes, what's the ultimate cause?
Q#2. Any potential issues if there is no domain controller in the new user segment? for example, will computer accounts become out of synch with AD?
Q#3. If there must be a domain controller in the new user segment, is it easy to modify svr-dc-dns2 and put it in the new 10.0.2.x network?
Q#4. Will more uses run into Outlook issues?

Thanks.

0
richtree
Asked:
richtree
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3 Solutions
 
Stelian StanCommented:
Can you ping the mail server from the user workstation?
Is 10.0.2.x network on a different site? If yes it's recommended to have a DC on that site.
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richtreeAuthor Commented:
Yes, workstations can ping all servers by ip and host names.
10.0.2.X is physically same site as 10.0.1.x,gigabit link between them.
Please comment on my questions.
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RadweldCommented:
I guess you have not configured the subnet in ad sites are services and allocated the subnet to a site. Once you have dine this the clients will be able to discover the correct dcs for them to use.
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richtreeAuthor Commented:
Is DC not required in the new subnet once a new site is added in AD?
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richtreeAuthor Commented:
Is it ok to add the new subnet (10.0.2.x) to the site where the original subnet (10.0.1.x) sits?
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RadweldCommented:
Yes, because what you are saying is both subnets belong to the site. If the subnet was belonging to a different site, say New York, then you would create a site for New York and assign the subnet to it. In your case, just add the new subnet to "Default-first-Site-Name" (unless you renamed the site)
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richtreeAuthor Commented:
thanks.
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