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Thank you! &nbsp;I did not know that it was not possible the other way around,<br />
Let me test this and revert back ...
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Hi Guys,<br />
<br />
I've setup a new Exchange 2016 server.<br />
The server was installed into an existing AD with an Exchange 2010 installation.<br />
<br />
All worked well and the new server is operational.<br />
<br />
Our firewall and DNS still points to the old server for Outlook Anywhere and is working for the mailboxes still on the old server.<br />
<br />
The issue:<br />
As soon as a mailbox is migrated to the new server, the mailbox becomes inaccessible via Outlook Anywhere.<br />
<br />
For example, trying to access the mailbox from OWA produces the following error:<br />
<i>A server configuration change is temporarily preventing access to your account. Please close all Web browser windows and try again in a few minutes. If the problem continues, contact your helpdesk.<br />
</i><br />
<br />
Is there a way to have Outlook Anywhere working for mailboxes on both the old and new server via Outlook Anywhere (the same host name)?
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Hi Guys,

I've setup a new Exchange 2016 server.
The server was installed into an existing AD with an Exchange 2010 installation.

All worked well and the new server is operational.

Our firewall and DNS still points to the old server for Outlook Anywhere and is working for the mailboxes still on the old server.

The issue:
As soon as a mailbox is migrated to the new server, the mailbox becomes inaccessible via Outlook Anywhere.

For example, trying to access the mailbox from OWA produces the following error:
A server configuration change is temporarily preventing access to your account. Please close all Web browser windows and try again in a few minutes. If the problem continues, contact your helpdesk.


Is there a way to have Outlook Anywhere working for mailboxes on both the old and new server via Outlook Anywhere (the same host name)?

New Exchange Server - Outlook Anywhere

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.

Exchange

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

Installation is the act of making a computer program program ready for execution. Because the process varies programs often come with a specialized program responsible for doing whatever is needed for their installation. Installation may be part of a larger software deployment process. Cross platform installer builders that produce installers for Windows, Mac OS X and Linux include InstallAnywhere, InstallBuilder and Install4J. Installers for Microsoft Windows include Windows Installer, InstallShield, and Wise Installation Studio; free installer-authoring tools include NSIS, IzPack, Clickteam, InnoSetup, InstallSimple and WiX. Mac OS X includes Installer, and also includes a separate software updating application.