The Online OLM Extractor is a window-based software developed for extracting Outlook OLM mailbox items(emails, attachments, Calendars, Contacts, Journals, etc.) into multiple formats like PST, PDF, TXT, HTML, EMLX, MHT, TIFF, DOCM, DOC, PNG, JPG, GIF, MBOX, etc. It also allows you to export OLM to Gmail, Yahoo, Office 365, Thunderbird, Opera Mail, Live Exchange, Hotmail, IMAP email clients without any loss of data.
Source: http://www.sysinfotools.com/data-recovery-news/news-2020.php