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<a href="https://www.msoutlook.info/question/outlook-2016-and-exchange-support" rel="ugc">Here</a> is a list for the supported Outlook/Exchange Compatibility.<br />
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There should not be a problem connecting your 2016 client to the 2010 Exchange - especially on the SP you are on.<br />
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What availability can they see? Nothing? Free/Busy time?
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Hi Michael. Thanks for your response. The users can see availability for some users but not others. Availability is not blocked. See the attachment for details.<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/12_w49/1214376/Julie-Johnson---Calendar.docx" target="_blank" class="file-inline" title="Julie-Johnson---Calendar.docx (127 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Julie-Johnson---Calendar.docx</a>
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Julie-Johnson---Calendar.docx

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Let's see config of your environment:<br />
(mask real domain, format as CODE, execute on Exchange 2016 EMS)<br />

<pre><code class="code-10 nolinks" id="code-20-42397022-1"><span>Get-OabVirtualDirectory | fl server, Name, ExternalURL, InternalURL, *auth*</span>
<span>Get-WebServicesVirtualDirectory | fl server, Name,ExternalURL, InternalURL, *auth*</span>
<span>Get-EcpVirtualDirectory | fl server, Name, ExternalURL, InternalURL, *auth*</span>
<span>Get-ActiveSyncVirtualDirectory | fl server, Name, ExternalURL, InternalURL, *auth*</span>
<span>Get-OutlookAnywhere | fl server, Name, *hostname*, *auth*</span>
<span>Get-OwaVirtualDirectory | fl server, Name, ExternalURL, InternalURL, *auth*</span>
<span>Get-ClientAccessService | fl Name,OutlookAnywhereEnabled, AutodiscoverServiceInternalUri</span>
<span>Get-ExchangeCertificate | fl FriendlyName, Subject, CertificateDomains, Thumbprint, Services, Issuer, *not*</span>
<span>Get-MapiVirtualDirectory | fl server, Name,ExternalURL,InternalURL, *auth*</span>
<span>Get-ClientAccessArray | fl</span>
<span>Get-OutlookProvider</span>
<span>Get-ExchangeServer | fl *version*</span>
<span>Get-OrganizationConfig | fl *mapi*</span>
</code></pre>
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Judging by what you have attached, it certainly looks like there is a permissions issue potentially to the ones that cannot be seen.<br />
<br />
This looks like the default view before permissions haven't been granted.<br />
<br />
I would test changing permissions on one of the accounts - it is a lot easier with PowerShell to do this.
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The reason @Michael Link I was concerned about compatibility between Outlook 2016 and Exchange 2010 was Outlook users MAPI over HTTP. That should work with Exchange 2010 using Outlook Anywhere settings. However I've seen articles where users complained about Outlook 2016 connecting to Exchange 2010.
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Great glad you found a solution - I hope moving to Exchange 2016 leaves you in good stead on a good steady platform!
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I fixed the problem myself and verified with the end user the issue was resolved.
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<div class="content wysiwyg-content">
A few users are reporting issues with being able to see the availability of other users when the create appointments. They reported the problem after upgrading to Office 2016. They're mailboxes are on Exchange 2010 SP3 UR17 however we're going to migrate to Exchange 2016 first quarter next year. Are there client connectivity issues between Outlook 2016 and Exchange 2010? What can I do to mitigate or resolve this problem for now?
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</div>


A few users are reporting issues with being able to see the availability of other users when the create appointments. They reported the problem after upgrading to Office 2016. They're mailboxes are on Exchange 2010 SP3 UR17 however we're going to migrate to Exchange 2016 first quarter next year. Are there client connectivity issues between Outlook 2016 and Exchange 2010? What can I do to mitigate or resolve this problem for now?

Outlook 2016 user on Exchange 2010 cannot see other user availability

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.