Download and assess the free edition of the PST repair tool and then only invest in the paid edition. The free edition gives a practical idea about the tool. It will allow you to experience the features of the paid version free of cost, except the saving option which has been restricted to 25 items from each recovered folder.
MS Outlook: From Outlook 97 to Outlook 2016
MS Windows OS: From MS Windows 95 to MS Windows 10
Mandatory Memory Space: Software installation requires 50 MB and basic operations require 64 MB RAM
Mandatory Disk Space: Enough space to restore repaired files