Search multiple .pst and .ost files without Outlook

There are a few methods that let you perform the Boolean search, Excel-like filtering or instant search in multiple .pst and .ost files without Outlook at once. Supports any .pst and .ost files: corrupted, orpah, archive, password protected and encrypted files. Looking to sensitive email or contact someone, but not certain which file or account you put it in, you'll be able to find it easily with a single search.

multiple pst search

PST file search tool

Open OST PST Viewer (pstwalker.exe), make sure that Outlook data files that you want to search are open (if they are, you'll see them all in the All Folders Pane). Select All Mail Items as the location for your search, choose Advanced search option and enter the keywords you want to search for in your .pst and .ost files. You can use the additional options to customize how your search term is searched, such as case-sensitive, email header fields, and so on.

Finally, click on the Search button or press Enter to begin searching. You can review the results as far as they appear on your screen. You can sort, filter and refine your search results to find exactly what you want.


  • Instant search results
    Review highlighted keywords so you don't need to look for the search criteria.
  • Search multiple keywords
    Refine your search using the boolean search operators and functions (AND, OR, NOT, ALL, ATLEASTONE, NEITHER, NOTALL, ?, *).
  • Fast multi-threaded searching
    Highly efficient search algorithms mean that you spend less time waiting for results.
  • Printing and Exporting
    Share your results with others using the printing and exporting features.
  • If you have many .pst files open, or if you have a few really large .pst files open, it may take a while to search for messages.

Filtering and sorting .pst files search results

Sort your search results and filter using the Quick grid view search or an Excel-like filtering interface.

1. Quick grid view search. Search text in the visible grid columns and draws a highlight box around any substring that matches its given text.

Quick grid view search

2. An Excel-like filtering interface. Right click on a column's header, a "Filtering" menu item will be presented. This will let the user select one or more distinct values from that column. When click "Apply", only those rows that have one of the chosen values for that column will be displayed.

Excel-like filtering