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Are both CLIENT and Exchange SERVER Domain Joined to the same Domain?
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Are both CLIENT and Exchange SERVER Domain Joined to the same Domain?

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Yes, They are joined to the same domain
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After migrating from the exchange server 2007 to 2013, our users keep getting Windows Security pop up for Microsoft Outlook, and The Exchange server 2013 Outlook anywhere authentication is set to NTLM.<br />
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Annotation-2020-02-19-083859.jpg

After migrating from the exchange server 2007 to 2013, our users keep getting Windows Security pop up for Microsoft Outlook, and The Exchange server 2013 Outlook anywhere authentication is set to NTLM.

Windows Security Pop up for Microsoft outlook after migrating to exchange server 2013

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

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.