You can also try OLM to PST Converter software, which helps you to export bulk Outlook OLM files to PST file format including emails, contacts, calendars, tasks, notes, and etc. The feature that impressed me the most was its ability to pick my emails directly from the Outlook database. It converts at a better speed and with better efficiency. This tool quickly converts all email items. It supports all versions of MS Outlook and Windows OS versions.