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hi experts,<br />
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&nbsp;i'm using outlook 2010 and when I type in an email address for a user, I get the following message. The user is in the address book and I do receive emails from him. I have to look him up in the address book and select his name from there. <br />
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This e-mail message cannot be delivered to &quot;usera&quot; because the email address is no longer valid.
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hi experts,

 i'm using outlook 2010 and when I type in an email address for a user, I get the following message. The user is in the address book and I do receive emails from him. I have to look him up in the address book and select his name from there. 

This e-mail message cannot be delivered to "usera" because the email address is no longer valid.

email address no longer vaild message in outlook???:

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.