To export Outlook PST address book and calendar entries manually, open Outlook and go to File > Open & Export > Import/Export. Select Export to a file, choose the desired format (e.g., CSV for contacts or ICS for calendar), and follow the prompts to save the data. However, this method can be time-consuming and limited in format options. The BLR PST Converter Tool simplifies this process by exporting PST address books and calendar entries into multiple formats like CSV, PDF, or HTML quickly and efficiently.