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NTLM authentication is recommended.
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<div>
NTLM Authentication is ideal for connecting clients that are domain members because the username and password will not need to be entered by the user each time they connect. &nbsp;However NTLM may not work with some firewalls or ISA Server publishing scenarios.<br />
<br />
You may like to refer to this article for the process of manually configuring Office 365 Exchange Online account with Outlook 2010 and 2013 for Windows. <a href="https://oit.colorado.edu/tutorial/office-365-outlook-windows-manual-exchange-configuration" rel="ugc">https://oit.colorado.edu/tutorial/office-365-outlook-windows-manual-exchange-configuration</a>
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NTLM Authentication is ideal for connecting clients that are domain members because the username and password will not need to be entered by the user each time they connect.  However NTLM may not work with some firewalls or ISA Server publishing scenarios.

You may like to refer to this article for the process of manually configuring Office 365 Exchange Online account with Outlook 2010 and 2013 for Windows. https://oit.colorado.edu/tutorial/office-365-outlook-windows-manual-exchange-configuration [https://oit.colorado.edu/tutorial/office-365-outlook-windows-manual-exchange-configuration]

<div>
Hi all,<br />
<br />
Thanks for the feedback.<br />
<br />
How about local user that are connected via VPN? so it is negotiation method for VPN user?
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Hi all,

Thanks for the feedback.

How about local user that are connected via VPN? so it is negotiation method for VPN user?

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<div class="content wysiwyg-content">
Hi expert,<br />
<br />
For connection between outlook 2010 client connect exchange, which authentication is more recommended? negotiation authentication or NTLM authentication?<br />
<br />
In our internal network environment, all PC need to go through proxy to access internet.<br />
<br />
<br />
With proxy connection, during setup do i still need to tick and enable msstd:exchange.contonso.co<wbr />m?<br />
<br />
Thanks.
</div>
</div>


Hi expert,

For connection between outlook 2010 client connect exchange, which authentication is more recommended? negotiation authentication or NTLM authentication?

In our internal network environment, all PC need to go through proxy to access internet.


With proxy connection, during setup do i still need to tick and enable msstd:exchange.contonso.com?

Thanks.

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