Question: When you open Outlook (2003/2007) hooked up to an Exchange server, sometimes you are prompted for network credentials. Sometimes it is because you opened it before the network/VPN connection was up or maybe it's just a glitch in Outlook.

For some reason, it keeps defaulting to `exchange server\user` instead of `domain\user` - which is required to log on.

e.g. `EXCHSERVER01\username` ;-(  

instead of `DOMAIN\username` :-) 

Not only is it very annoying, but it prevents technically challenged users from logging into Outlook because they never know to change it to the domain name.

Anyone know of a fix, maybe a change of setting within Outlook that will prevent this from happening and always try to log on with domain\user credentials? Not really fussed if the credentials box continues to popup, it's trying to make it default to `domain\user`.

Answer: 
I've been thru that so many times and how I fixed that issue is quite simple. I just needed to go in AD and reset user's password. Then, the user needed to log off and log back in. The connection with Exchange was quick and no username/password were required.

Give it a try, it takes 2 minutes and worked for me all the times.
The problem was Outlook had picked up rogue "RPC of HTTP" settings during the setup of the account on the computer. I went into the account settings, into the Connection tab, unticked 'Connect to my Exchange mailbox using HTTP' and restarted Outlook. Instant fix.

Saying that, this fix is only for Outlook 2007 - so I have only really answered half my question :\

![alt text](https://i.stack.imgur.com/Tc1qY.gif)