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Try to do this <br />
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OL2000: (CW) How to Clear the AutoNameCheck List<br />
<a href="http://support.microsoft.com/default.aspx?scid=kb;en-us;198008&Product=out" rel="ugc">http://support.microsoft.com/default.aspx?scid=kb;en-us;198008&Product=out</a><br />
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and then enable autocomplete option and see if it would do the autocomplete fine
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Try to do this

OL2000: (CW) How to Clear the AutoNameCheck List
http://support.microsoft.com/default.aspx?scid=kb;en-us;198008&Product=out [http://support.microsoft.com/default.aspx?scid=kb;en-us;198008&Product=out]

and then enable autocomplete option and see if it would do the autocomplete fine

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I am using MS Outlook 2000 on W2K Professional. &nbsp;I have about 1000 contacts in my address book in Outlook and I just switched computers. &nbsp;I used to be able to type in the name of the person I am sending my email to and it would recognize the person's name and underline and authenticate who I am sending my email too. &nbsp;Now when I type the person's first name in, it will not automatically recognize and underline the email address that I am trying to send my email too, instead I actually have to go to my address book and select the person I want to send my email too. &nbsp;Please, let me know if there is a setting in Outlook that I need to select or how I can fix this email lookup problem. &nbsp;Let me know if you need more information. &nbsp;Thanks in advance.
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I am using MS Outlook 2000 on W2K Professional.  I have about 1000 contacts in my address book in Outlook and I just switched computers.  I used to be able to type in the name of the person I am sending my email to and it would recognize the person's name and underline and authenticate who I am sending my email too.  Now when I type the person's first name in, it will not automatically recognize and underline the email address that I am trying to send my email too, instead I actually have to go to my address book and select the person I want to send my email too.  Please, let me know if there is a setting in Outlook that I need to select or how I can fix this email lookup problem.  Let me know if you need more information.  Thanks in advance.

Email Address look up and recognition when writing email

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.