To convert offline OST emails to PST without attachments, you can use a reliable Softaken OST to PST Converter tool that simplifies the process by directly converting OST files into your PST format. This software also provides a solution to upload the OST files into the Webmail emails client which works on IMAP Protocol. The OST converted into PST files are compatible with all Outlook editions. Refer: https://www.softaken.com/ost-to-pst-converter