We help IT Professionals succeed at work.

We've partnered with Certified Experts, Carl Webster and Richard Faulkner, to bring you a podcast all about Citrix Workspace, moving to the cloud, and analytics & intelligence. Episode 2 coming soon!Listen Now


outlook 2003 fails to use dun but ie works

IanTh asked
Medium Priority
Last Modified: 2010-04-08
wierd ine

outlook 2003 fails to use dun unless it is specifically told to use my phone line

but want it so lan is used if no lan use dun
Watch Question

From Microsoft - http://support.microsoft.com/?kbid=287532

Connection Tab
1. Connection Section The Connection tab contains information about how to connect to your e-mail server. There are three ways to connect to your ISP's e-mail server. Select one of the appropriate connection type listed in this section.

a.  Connect using my local area network (LAN): This connection allows you to log on to your e-mail server through your existing network connection. Your network configuration must support access to the Internet. Please see your network administrator for more details.
b.  Connect using my phone line: The Internet Mail Service looks for a Dialup Networking connection to establish a log on with your ISP. Once you are logged on to your ISP, it attempts to connect to your ISP's e-mail server. If this section is not available (grayed out), it may indicate that the Microsoft Windows Dialup Networking feature is not installed on your computer. Please refer to the "If Dialup Networking Is Not installed" section of this article for more information.
c.  Connect Using Internet Explorer's or a 3rd Party Dialer: If you click to select this option, Outlook uses a default connection method that has already been configured.
2. Modem Sectiona.  After you click Connect using my phone line, you must define a Dialup Networking connection to use. You can select an existing connection from the list, or you can click Add to create a new connection.
b.  To edit the properties of a connection, use the drop-down list box to select the desired connection, and then click Properties. This takes you to the existing connection's Properties page.

What they fail to mention here is the checkbox under option 1 - "Connect via modem when Outlook is offline" Which I would take as a reference to Exchange Server.

It looks like you need to switch from one methond to the other - LAN to DUN...

But I wonder if you select the third option - Internet Explorer and configure that to "Dial whenever a network..."

Maybe that would work? I'm not really sure as I haven't used a dial-up for almost 10 years.


i have tried the 3rd option and it doesn't work but that is what I wanted to use

any idea guys

btw ie does work
Top Expert 2008

Greetings, IanTh !

Go to Tools > E-mail Accounts > View or change existing e-mail accounts > Next.
Select the account, and then click Change.
Click More Settings, and then click the Connection tab.
Select Connect using Internet Explorer.  Click OK, Next, Finish.

Since Internet Explorer works correctly the way you want it, so now should Outlook.  In IE, go to Tools > Options > Connections.  Is "Dial whenever a network connection is not present" selected?

Best wishes!

>> There are three ways to connect to your ISP's e-mail server. Select one of the appropriate connection type listed in this section.
>>> a.  Connect using my local area network (LAN).
>>> b.  Connect using my phone line.
>>> c.  Connect Using Internet Explorer's or a 3rd Party Dialer.

I think this says it all... Nothing about having a dialup as an automatic backup when not on a lan.

Are you wanting to change a compuer that you travel with, without having to change the settings yourself? You could probably find the settings in the registry and make a copy of the key configured in each way dun and lan. And then apply the registry update from a shortcut on your desktop.
Top Expert 2008


If selecting IE connection does not work, then some program or addin is interfering with Outlook or Outlook is corrupt.

1. Reset the Outlook toolbar template. With Outlook close, do a search for and rename outcmd.dat file. Restart Outlook and a fresh outcmd.dat file will be recreated.

2. Register an important Outlook file. Go to Start > Run and type regsvr32 OLE32.DLL

3. Disable Outlook Addins.  With Outlook close, do a search for and rename extend.dat file.

4. Start Outlook in Safe Mode.  Go to Start > Run and type

"c:\Program Files\Microsoft Office\Office\Outlook.exe" /safe

Your path to Outlook.exe may be a little different.

5. Create a new Outlook profile.

6. Repair Outlook. With Outlook open, go to Help > Detect and Repair.

7. If no joy, reinstall Outlook.  Go to Add/Remove Programs and highlight Microsoft Office. Click on Install/Uninstall.  A menu will pop allowing you to choose repair or reinstall.



are sorted my self outlook was not in offline mode doh!

so thanks guys
Top Expert 2008

IanTh, glad the problem is fixed. Are you saying the Outlook was or was not in offline mode, which cause the DUN not to work?


its was not offline as I though that only worked with exchange but after I checked offline it worked fine

silly me :(
PAQed with points refunded (500)

Community Support Moderator

Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts
Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.