Outlook 2016 user on Exchange 2010 cannot see other user availability

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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Bill BensonPrincipal ConsultantAsked:
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Michael LinkInfrastructure EngineerCommented:
Here is a list for the supported Outlook/Exchange Compatibility.

There should not be a problem connecting your 2016 client to the 2010 Exchange - especially on the SP you are on.

What availability can they see? Nothing? Free/Busy time?
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Bill BensonPrincipal ConsultantAuthor Commented:
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.
Julie-Johnson---Calendar.docx
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RoninCommented:
Let's see config of your environment:
(mask real domain, format as CODE, execute on Exchange 2016 EMS)
Get-OabVirtualDirectory | fl server, Name, ExternalURL, InternalURL, *auth*
Get-WebServicesVirtualDirectory | fl server, Name,ExternalURL, InternalURL, *auth*
Get-EcpVirtualDirectory | fl server, Name, ExternalURL, InternalURL, *auth*
Get-ActiveSyncVirtualDirectory | fl server, Name, ExternalURL, InternalURL, *auth*
Get-OutlookAnywhere | fl server, Name, *hostname*, *auth*
Get-OwaVirtualDirectory | fl server, Name, ExternalURL, InternalURL, *auth*
Get-ClientAccessService | fl Name,OutlookAnywhereEnabled, AutodiscoverServiceInternalUri
Get-ExchangeCertificate | fl FriendlyName, Subject, CertificateDomains, Thumbprint, Services, Issuer, *not*
Get-MapiVirtualDirectory | fl server, Name,ExternalURL,InternalURL, *auth*
Get-ClientAccessArray | fl
Get-OutlookProvider
Get-ExchangeServer | fl *version*
Get-OrganizationConfig | fl *mapi*

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Michael LinkInfrastructure EngineerCommented:
Judging by what you have attached, it certainly looks like there is a permissions issue potentially to the ones that cannot be seen.

This looks like the default view before permissions haven't been granted.

I would test changing permissions on one of the accounts - it is a lot easier with PowerShell to do this.
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Bill BensonPrincipal ConsultantAuthor Commented:
I showed the user a workaround. I had her delete the name she was having trouble getting availability for from the nickname cache then pick it again from the GAL. That worked for her but I'll dig into this a bit more though.
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Bill BensonPrincipal ConsultantAuthor Commented:
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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Michael LinkInfrastructure EngineerCommented:
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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Bill BensonPrincipal ConsultantAuthor Commented:
I fixed the problem myself and verified with the end user the issue was resolved.
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