To Export Office 365 account to PST? Then I would like to suggest you can also try Mailsbackup Office 365 Backup Tool is the best way to backup Office 365 mailbox and restore Office 365 mailbox to hard drive or webmail. It easily creates & take backup of Office 365 emails, contacts, calendars, etc. direct option to Export Office 365 account to PST, EML, MBOX, MSG, EMLX, DOC, PDF, RTF, HTML, XPS, MHT, CSV, ZIP, etc.

Check for more details at: https://www.mailsbackup.com/office-365/