Use the eSoftTools PST to MBOX Converter Software to convert PST to MBOX files. It can easily convert all pst files to mbox files. This software is simple to use. It will show a live preview of emails and attachments while converting the Outlook pst file to the mbox file. All users have access to the free demo pack to check its working performance.
Click here:- Convert PST File to MBOX
Use the EAC to connect a disabled mailbox
In the EAC, navigate to Recipients > Mailboxes.
Click More. , and then click Connect a mailbox.
Click the disabled mailbox that you want to reconnect, and then click Connect.
In the window that asks if you're sure that you want to reconnect the mailbox, click Yes.
Regards,
Willjoe