Restore the Check Names button with IMAP/LDAP Directory Services
Since the Mac Outlook 15.17 version was released, the Check Names button is no longer available with IMAP/LDAP Directory Service email accounts. Every subsequent update through the current 15.22.0 (160506) has the same problem. This Check Names button is grayed-out and unavailable for name resolution against an LDAP DS. The keyboard command Ctrl+Cmd+C also does not work. Check Names appears to only be available with Exchange accounts now.
This issue has not been resolved from versions 15.17 through 15.33 (170315) and affects all my business clients on Mac.
Xpost from https://answers.microsoft.com/en-us/msoffice/forum/msofficeoutlook-msomac/mac-outlook-1517-check-names-button-no-longer/05d1e88d-6791-42e8-afae-8c4457fc29d1