When you look over the Internet search tools for PST to Office 365 migration then you will find numerous utility present to upload PST file to Exchange Online accounts. One of the most recommended applications is MailsDaddy PST to Office 365 Migration Tool which is very helpful to migrate PST to Office 365 Cloud mailbox. The software is highly proficient for both ANSI or UNICODE Outlook PST files and performs without installing or configuring MS Outlook in the Desktop.
As per google search, I have found one of the best software by SysInfoTools named SysInfo Office 365 Tool. The tool is here to Backup Emails, Contacts, Schedule Meetings, and Calendars of Office365. Store and download Office 365 Mailbox to PST, EML, EMLX, MSG, MBOX, HTML, and MHTML. Provide date range filter option. And free demo version allows users to Backup 25 emails of Office365 for free.
For knowing more prominent feature read: https://www.sysinfotools.com/office365-backup.php