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Don't need your rude comments. apparently you didn't read the question thoroughly.
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Where you see rude comments? Just said poor planning, does not need to be yours nor is it personal.
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Like i stated this is a rare situation and not much reference on the case to be found.<br />
Mail migrations like this needs preparation and planning so making a 180 in the middle is not advisable.<br />
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So solution IMHO is given.
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You did not provide a solution, just inappropriate comments
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I was in the middle of an Exchange migration from 2010 to 2016 (single site, stand-alone installation). I got as far as installing exchange 2016 on the new box. &nbsp;And this we decided to migrate to office 365 instead. &nbsp;So now I tried to uninstall Exch 2016 and it appears it's going to give me hell.<br />
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What is the easiest/quickest way to uninstall it?
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I was in the middle of an Exchange migration from 2010 to 2016 (single site, stand-alone installation). I got as far as installing exchange 2016 on the new box.  And this we decided to migrate to office 365 instead.  So now I tried to uninstall Exch 2016 and it appears it's going to give me hell.

What is the easiest/quickest way to uninstall it?

Uninstalling Exchange 2016

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

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.