If you are looking for a solution to Migrate the Outlook PST data to Office 365 Exchange Online. Then you can use the Network Upload Method or an advanced software named A2Z Migrations for PST to Office 365. Using this solution a user can convert the Outlook PST data like emails, contacts, calendars, tasks, appointments, and attachments, etc into Office 365. It also parallelly migrate the bulk PSTs to the Multiple Office 365 account. And It also maintains the same folder structure after converting the PST to the o365 Cloud Platform. To get more details, visit: http://www.a2zmigrations.com/pst-to-office365/