We're using the Enterprise version 10.23 with several users using the latest version of the MAPI connector - a mix of Office 2010, 2016 and 365. Mail and calendar entries are syncing properly - busy/free time appears correctly when testing in the web client (which we don't use much,) however the busy/free time doesn't appear in Outlook.
It says it's supported:
Reviewed this thread:
I confirmed that the MailEnableFB.DLL is registered on two of the machines (Win 10/Office 365 and Win 10/Office 2010).
Please let me know if there are any other troubleshooting steps that I can take to try and get this working. Thank you.