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I want to create retention policy in data lifecycle management, my goal is whenever user with license has been deleted, I want to retain his whole exchange online mailbox for 6 months after that it will be deleted automatically as shown in my configuration below.
Am aware that retention policy will start to trigger after user deletion and unassigned his license
but I get a message that confusing me and didn't make sense to me "Items that are currently older than 6 months will be deleted after you turn on this policy" I need explanation for this message, also am I doing the configuration that meets my goal? I don't want to make eDiscovery hold manually every time. NOTE: most users have M365 Business standard License
Help me please
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I'm afraid all retention or hold are calculated from the date a mailbox item is received or created.
You cannot set the date you remove the account license as the start date, and keep all items for same duration from then.
You could take a reference at the result shared in this post apply this policy: How to delete old documents from a site using retention policies
For more information: Learn about inactive mailboxes