You want to keep a user's mailbox indefinitely, however, you do *not* want to keep their AD account (or you want it disabled). Converting it to a shared mailbox still anchors it to their AD account, so purging that deletes the mailbox.
- Delete or Disable the account in AD, or, move the account to an OU not synced by AD Sync
- Run an AD Sync.
- Ensure the account is gone in Office 365.
- In Office 365 Admin Center, open the Azure Active Directory Admin Center.
- Go into Users, Deleted Users, find the user in question, check the box and click "Restore User".
- Go into the user's cloud account and reapply the license.
- Once their mailbox is in Exchange Admin Center, convert the mailbox to a shared mailbox.
- Remove the license from their user account.
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