A. Run the Set-OWMailboxPolicy cmdlet and specify the CExplicitLogonEnabled $true parameter
B. Run the Set-OWMailboxPolicy cmdlet and specify the CAllowOfflineOn NoComputers parameter
C. On the Edge Transport server, run the Set-OwaVirtualDirectory cmdlet and specify the C AllowOfflineOn NoComputers parameter.
D. On each Mailbox server, run the Set-OwaVirtualDirectory cmdlet and specify the CExternalURLs $null parameter.