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The GAL takes up to 24 hours to rebuild if left to it's own devices.<br />
<br />
You can try a force rebuild of the GAL. &nbsp;<br />
<br />
Open Exchange Management Console<br />
- Organization Configuration<br />
-- Mailbox<br />
--- Offline Address Book tab<br />
----- Right click the &quot;Default Offline Address Book&quot; and select 'Update'.
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The GAL takes up to 24 hours to rebuild if left to it's own devices.

You can try a force rebuild of the GAL.  

Open Exchange Management Console
- Organization Configuration
-- Mailbox
--- Offline Address Book tab
----- Right click the "Default Offline Address Book" and select 'Update'.

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I usually follow this guide to push the GAL<br />
<br />
<a href="https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_8392-Manually-Update-Global-Address-List-GAL-on-Exchange-2010.html" rel="ugc">https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_8392-Manually-Update-Global-Address-List-GAL-on-Exchange-2010.html</a>
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I usually follow this guide to push the GAL

https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_8392-Manually-Update-Global-Address-List-GAL-on-Exchange-2010.html [https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_8392-Manually-Update-Global-Address-List-GAL-on-Exchange-2010.html]

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The users have been in the system for much more than 24 hrs. &nbsp;I did try forcing a rebuild. &nbsp;I followed the instruction in the link given by NRhode and it worked if I manually deleted the .oab from the user profile. &nbsp;However doing this for every user especially if I have to do it everytime I change the GAL is not practical.
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The users have been in the system for much more than 24 hrs.  I did try forcing a rebuild.  I followed the instruction in the link given by NRhode and it worked if I manually deleted the .oab from the user profile.  However doing this for every user especially if I have to do it everytime I change the GAL is not practical.

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That did it! &nbsp;Thanks so much!
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New users added to Exchange 2010 are not showing up in the Global Address List on Outlook 2013 clients. &nbsp;I have tried forcing a sync of the calendar and the users still do not show up. &nbsp;If I check the GAL on OWA or on Outlook 2003 the GAL is correct.
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New users added to Exchange 2010 are not showing up in the Global Address List on Outlook 2013 clients.  I have tried forcing a sync of the calendar and the users still do not show up.  If I check the GAL on OWA or on Outlook 2003 the GAL is correct.

Outlook 2013 not receiving updated GAL from Exchange 2010

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.