INFO: Unread Enterprise Vault messages show as Read after migrating the EV archive
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Overview
Consider the following scenario.
Enterprise Vault archived unread messages from a mailbox.
The data was then migrated from EV to an M365 mailbox using EVComplete.
After the migration, it was discovered the unread messages in the archive are now showing a read when viewing them in the M365 mailbox.
This behavior is by design with EVComplete. Any unread messages will be flagged as read during the migration process.