You can convert your OLM files to PST by using the manual method or you can opt for professional software. In this regard, Vartika OLM to PST converter is one of the best software that I have ever experienced. It has an amazing graphic user interface that will guide you to execute the task without the need for any technical assistance. You can also find some amazing smart features in this software that will help in maintaining the data integrity along with its original structure. You can try its free demo version to analyze its performance.