Outlook 2016 automatically routing incoming messages to a folder, not to the inbox, if the messages are responses to a message in that folder.

Migrated SBS 2011 to Server 2016, on-premises Exchange 2106. Reconnected client PCs, Outlook 2016 in use for some time.  All looks well, BUT:

System admin account sees Public Folders, content as migrated from SBS 2011, but other user accounts do not.  How do I fix this?

Outlook behaves differently, this scenario: We have a routine where, if a user receives a message which is specifically personal or private, they move it to an appropriate folder. When they reply to the message, with the previous system, any expected reply came back to the Inbox. With the new system, with no change to settings on the client PC, the reply comes back directly to the private folder, with no indication that it has arrived, other than the ‘unread records’ number going up.  This is unworkable - how do we restore the 'old' behaviour?
Frank KayAsked:
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challa ashokkumarDesktop SpecialistCommented:
How does it work on webmail? Please check once behavior in webmail. If it works as expected in webmail, you can delete outlook appdata files and current user registry.

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viktor grantExchange ServersCommented:
HI Frank,

Where are admin account located in SBS or Exchange 2016?

You need to check if only migrated users are able to see public folders or users located in SBS.

viktor grantExchange ServersCommented:
No more replies from the author..enough information to confirm that the issue is solved
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