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In Outlook 2010 , only &quot;your personal contacts&quot; will show in My Contacts. After you add the external email addresses into Contacts in Exchange admin center, they can be found in Outlook 2010 by :<br />
<br />
A: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Click Address Book on the top menu bar.<br />
B: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Select Offline Global Address List from the Address Book drop down list.<br />
<br />
If you want the external contacts to show in My Contacts tab, add them as your personal contacts in OWA or in Outlook.
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In Outlook 2010 , only "your personal contacts" will show in My Contacts. After you add the external email addresses into Contacts in Exchange admin center, they can be found in Outlook 2010 by :

A:      Click Address Book on the top menu bar.
B:      Select Offline Global Address List from the Address Book drop down list.

If you want the external contacts to show in My Contacts tab, add them as your personal contacts in OWA or in Outlook.

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I meant I did not see that contact in Address Book not My Contact. Event I searched for that contact in Offline Global Address list. In addition, I added that contact in distribution list in Exchange server but I did not see that contact in that list either.
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I meant I did not see that contact in Address Book not My Contact. Event I searched for that contact in Offline Global Address list. In addition, I added that contact in distribution list in Exchange server but I did not see that contact in that list either.

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Yes, it is hidden from address book. Thanks,
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Yes, it is hidden from address book. Thanks,

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<div class="content wysiwyg-content">
Hi all,<br />
One external contact is now shown in Outlook. I checked that it was created in AD and in Exchange 2010 as a mail contact. It was also added to one distribution list. However, I could not see it in Outlook or in that distribution list. <br />
Please give some advices.<br />
Thanks,
</div>
</div>


Hi all,
One external contact is now shown in Outlook. I checked that it was created in AD and in Exchange 2010 as a mail contact. It was also added to one distribution list. However, I could not see it in Outlook or in that distribution list. 
Please give some advices.
Thanks,

Exchange 2010: External contact is not shown in Outlook

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

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.