To import Outlook PST files to Hotmail, you can use the SysTools IMAP Import Tool to migrate email data to a supported IMAP server. First, convert or prepare your PST data into a supported email format, then configure the destination IMAP account using the required server details and credentials. The tool can help transfer emails in bulk, reducing the need for manual uploads. Before starting, confirm that your Hotmail account and source file format are supported, and verify the migrated emails, attachments, and folder structure after completion.