To backup PST files to an Office 365 account, you must try the SysInfo PST Converter. This software helps to backup PST files to Office 365, Gmail, Yahoo Mail, IMAP, AOL, and many more in bulk at once. It has the feature to convert PST files to various file formats such as PDF, MBOX, MSG, and so on without losing the data. It has the benefit of maintaining the folder hierarchy as per the actual files. It assists in skipping the same PST files based on distinct criteria throughout the process. Along with this, it includes the feature to migrate or backup PST files with or without email attachments. Users can easily use this tool on all Windows OS versions, including Windows 11.