First, I would start with checking your Outlook Express connection settings to make sure that match what you are using for Outlook 2000. The second thing I would do is update and run a virus scan. There are a number of Trojan Horse programs that use fake error messages to trick users into revealing their user names and passwords (Spartan Horse comes to mind).
Dig Deeper on Enterprise Infrastructure Management
Related Q&A from Bernie Klinder
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.