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Are you trying to setup the account as an Exchange account or as a POP3 account?
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Are you trying to setup the account as an Exchange account or as a POP3 account?

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Is pop3 enabled on your exchange server?
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use full user name and domain for login &nbsp;i.e. domain\username 
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use full user name and domain for login  i.e. domain\username

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Are you using the same settings that you did with Thunderbird - i.e. POP server, username, password?<br />
<br />
It could be the way your username has been entered<br />
<br />
Try DOMAIN\USER\MAILBOX<br />
Try the e-mail address<br />
<br />
This article may help:<br />
<a href="http://www.msexchange.org/tutorials/Connecting_POP_And_IMAP_Clients_To_MS_Exchange_Server.html" rel="ugc">http://www.msexchange.org/tutorials/Connecting_POP_And_IMAP_Clients_To_MS_Exchange_Server.html</a>
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Are you using the same settings that you did with Thunderbird - i.e. POP server, username, password?

It could be the way your username has been entered

Try DOMAIN\USER\MAILBOX
Try the e-mail address

This article may help:
http://www.msexchange.org/tutorials/Connecting_POP_And_IMAP_Clients_To_MS_Exchange_Server.html [http://www.msexchange.org/tutorials/Connecting_POP_And_IMAP_Clients_To_MS_Exchange_Server.html]

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I am having problems setting up email on outlook 2010. Email is located on a remote exchange 2003.<br />
I have test account using thunderbird and work fine.<br />
The error message is:<br />
Log onto incoming mail server (pop3). Your email server sever rejected your user name. Verify your user name for this account in Account Settings. The server responded -err invalid command.
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I am having problems setting up email on outlook 2010. Email is located on a remote exchange 2003.
I have test account using thunderbird and work fine.
The error message is:
Log onto incoming mail server (pop3). Your email server sever rejected your user name. Verify your user name for this account in Account Settings. The server responded -err invalid command.

Having issue setting up email on outlook 2010. Using Exchange 2003

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.