The large PST files can cause a serious issue that makes effect the performance of the Microsoft Outlook. And your MS Outlook starts the hanging as well as makes the Outlook issues. Hence large Outlook PST files create the corruption issues on the Outlook and it loses all the emails contents and other messages. But here is no matter to worries. I have a suggestion for you. Use the Split PST files software that easily split the large PST files into the small PST files.
*Free Trial version offer only two PST splitting options, i.e. 'By Size' and 'Select and Split'. For more features, you need to register the full version licence.