This error occurred when I tried to check my mail in Outlook Express. The error is stating:

“Error found in Custom UI XML of McAfee AddIn; Line: 1, Column: 118, Error Code 0x80004005, Unknown Namespace: //schemas.microsoft.com/office/2009/07/customui, Element: Custom UI. ” 

And another error message appears when I hit the OK button on the first error message:

“Error found in Custom UI XML of McAfee AddIn, Line 106, Column: 11, Error Code: 0x80004005, The node is neither valid nor invalid because no DTD/schema declaration was found. ”

Hi. I need help as I’m getting a “Proxy Error (Logon failure: unknown username or bad password)” when trying to access my Hotmail account. I am using Outlook Express 5 through ISA. Please help me on this error. Thank you.

My Outlook Express 6.0 has been eliminating my inbox and all the folders I created. I want to know the reason why because this has not happened before. I bet some settings have been change, but I could not find anything in Outlook that concerns with this one. Does anyone have any idea? Thanks!

My hard drive is not working.

The problem is I have some emails in my Outlook Express that I have to retrieve.

How will I be able to do this if I can't even boot up my laptop?

Will the server keep a copy of those emails?

I’m hoping for your suggestions and advices.

I'm having problem in my Outlook Express 2003. Few days ago, I can still be able to send emails.

But now, I could not send emails but I can still receive them.

I got this error message: An unknown error has occurred.

Server Response: 554 Message refused, Port: 25, Secure (SSL): No, Server Error: 554, Error Number: 0x800CCC6F. I tried to read an article about the error mentioned above but the link is already invalid.

I have installed a few programs ever since my Outlook Express last worked, and it did not meddle up with my Outlook before.

My Gmail and my other online services were working as usual; just that I could not send emails with my Outlook Express.

Can somebody please help me with this problem?

My online email account suddenly disappeared. I have been using Mozilla 1.7.12 and Outlook Express for my mails. But my Outlook Express got a bug and prevents it from downloading my emails from a specific mail server. Unfortunately no one could fix it. I tried rerouting this mail with Outlook Express through FastMail.

People from my contacts were constantly asking me if I have received their emails. I have to get them for me to send emails to an alternate Yahoo email address. After some time, I have seen a new email notification at the bottom right of my screen. When I clicked it, Mozilla Mail showed me all of my missing mails.

My Outlook Express was working fine last night, but after installing Internet Explorer 7, I could not log into my Hotmail account anymore via Outlook Express. It says that either the email or my password is invalid. When I tried logging in again using Mozilla, I was able to log in. I bet the problem is with the Internet Explorer 7. I can't even view the link http://uk.playstation.com/pdcf/index.jhtml. It seems to have no text separated with the gray background. Can someone please help me? I am running Windows XP Professional SP2.

I received an error message in Outlook Express while I was sending emails. The error is "Unknown error 0x800CCC0B". I can't get rid of this one. The system works fine but the error message is appearing simultaneously as I work on Outlook. Can someone please help me?

I migrated from MS Outlook Express to MS Outlook 2003. And I am starting to think about the possible issues that I will face in the future so I will ask it now. Can you please help me on how can I send an email with RSVP settings? And does my address book different from MS Outlook contact list? How about the AutoComplete feature?