Yep, you’ve seen so many like this one, mostly they will suggest you to stop Exchange searching services, then delete the indexing folder (located inside the database folder) and then restart the searching services. Well, that would work if you don’t have DAG. Again, mostly you’ll find suggestions to use the update-mailboxdatabase with -catalogonly key … تابع قراءة What to Do? Exchange Server ContentIndexState Failed or Unknown with DAG