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Content Index State Healthy And Upgrading - Webbanshee
February 28, 2019 at 1:07:08 AM GMT+1 - permalink -"Upgrading to Version CU7 or higher comes with a mailbox database schema-update.
After the update has been installed you will notice that HealthyAndUpgrading is displayed under ContentIndexState."- https://webbanshee.net/content-index-state-healthy/