You can simply visit the blog on how to repair OST file where you can find the best solutions using a manual method and a professional tool to resolve the given issue. In the manual section, you can find a technique named SCANOST.exe which is a technical method and have some complex steps to perform. On the other hand, the advanced tool is quite easy to repair the OST file with its user-friendly interface. Now, it depends upon you which technique you are about to consider. But, to make the task hassle-free and effortless, always I prefer going with the professional utility.