The easiest way to transfer Outlook 2016 data to Office 365 is by using Outlook Converter Software from MSOutlookHelp. This professional tool efficiently exports Outlook PST files, including emails, contacts, and calendars, directly to Office 365 and other email clients like Gmail, Yahoo, and Thunderbird. It supports bulk conversion, large PST files, and maintains complete data integrity during migration. Users can also filter emails by date range and rename output files for better organization. The software is user-friendly, compatible with all Windows versions, and offers a free demo to convert 25 emails.