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Thank you for your rapid solution!
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Happy to have been able to help.
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Greetings Experts,<br />
<br />
Could you please clarify to me what's the difference between Outlook Anyware and Autodiscover?<br />
<br />
<b>Q1)</b> When autodiscovery is required and when the Outlook Anyware?<br />
<b>Q2)</b> Why both require external access? <br />
<b>Q3)</b> When a mobile/remote device will try to access Autodiscover and when Outlook Anywhere?
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Greetings Experts,

Could you please clarify to me what's the difference between Outlook Anyware and Autodiscover?

Q1) When autodiscovery is required and when the Outlook Anyware?
Q2) Why both require external access? 
Q3) When a mobile/remote device will try to access Autodiscover and when Outlook Anywhere?

Difference between Outlook Anyware and Autodiscover in Exchange 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

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

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.