It is very simple and easy to use, I have used it for 3 times and all my problems were solved in an instant. I am able to solve problem of multiple PST files as well. It has saved me a lot of time. The only thing that I dislike about this software is that it doesn't offer more features like other software. If you are looking for a simple solution to merge multiple pst files into one or convert multiple pst files into mbox then you should definitely go for this software. I was able to fix my problem regarding multiple pst files by converting them into single mailbox file. Also by merging them I was able to reduce my mailbox size which was causing space issues.