If your Outlook is not loading, and you are able to open the OST file. In this situation, you decide correctly to open the OST file in Chrome. To open an OST file in Chrome, you need to convert the OST file to HTML format. I would recommend a professional tool for converting the OST file into HTML format, because if you use the manual method, it can be time-consuming. Firstly, it is not working in your situation because it works when Outlook is opening or properly loading. Use the DataVare OST to HTML Converter Expert tool to convert OST to HTML. I also use this software. It supports bulk conversion and is compatible with all versions of Windows and MS Outlook.