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Todd,<br />
If we do not cutover for 24 hours, &nbsp;will we get a lot of errors from the new 2016 servers Autodiscover?<br />
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Will this be noticeable to users? &nbsp;Or will this just be noticeable in the logs?
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The Outlook client users will most likely get untrusted certificate pop-ups but those can safely be ignored.
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If you are installing Exchange 2016 in a mixed exchange environment with Exchange 2010 will the first Exchange 2016 server installed take over all of the Internet facing tasks like Active Sync, Webmail, Outlook Anywhere, Autodiscover? &nbsp;Will it take over all of the CAS Server duties without being configured to do so?
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If you are installing Exchange 2016 in a mixed exchange environment with Exchange 2010 will the first Exchange 2016 server installed take over all of the Internet facing tasks like Active Sync, Webmail, Outlook Anywhere, Autodiscover?  Will it take over all of the CAS Server duties without being configured to do so?

Todd,
If we do not cutover for 24 hours,  will we get a lot of errors from the new 2016 servers Autodiscover?

Will this be noticeable to users?  Or will this just be noticeable in the logs?

The Outlook client users will most likely get untrusted certificate pop-ups but those can safely be ignored.

Exchange 2016 Installation behavior

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.