Why would retention properties be missing from the Inbox folder while available on other folders of that account ? Also, on another computer, the retention properties ARE available for the Inbox of the same IMAP account. Confusing.
Did you check under Synchronization & Storage if it is still there?
To get there, Right-Click on the Account and choose Account
Settings.ย You will then see Synchronization & Storage
settingsย >>ย Disk Space settings.
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