If you want to convert a shared mailbox into an Office 365 mailbox, think of it like moving a group storage box into a personal drawer. Everything inside—emails, contacts, calendar entries—needs to go to the new place without losing order. Using the SysInfo Office 365 Backup Tool makes this easy. You sign in, pick the shared mailbox, and then choose where in Office 365 you want the data to land. The tool keeps everything organized and moves the entire mailbox in one go, so you don’t have to export or import anything manually.
Read more: https://www.sysinfotools.com/blog/migrate-shared-mailbox-to-office-365/