Corruption of OST file is very worst situation of OST file users and user unable to access OST file in Outlook profile. There are two ways for resolving such type of situation i.e either use a manual trick or use third party tool. Both solutions are effectively doing the task, If you are confused which solution you can use, then I suggest first try manual tricks. But if you have a large size of OST file, then you can use any professional third party tool.
Learn more details here:- Easy way to convert OST to PST.