My hotmail account has been migrated to Microsoft Exchange, so I have recreated my eM Client account as type Exchange.
In eM Client, my email and calendar entries are present, but my contacts are missing. They are all present in Outlook.com, Windows 10 Mail, and iOS on my iPhone.
Menu -> Tools -> Operations -> Errors shows repeated error messages like this:
An error occurred
Synchronizing folder ‘MYNAME@hotmail.com/Contacts/’ failed due to the following
error: Invalid data source operation., There was a problem accessing Active Directory.
Check your network connections and try again.
I have eM Client version 7.0.27943.0 (released October 21, 2016)