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Sometimes, due to various reasons, Exchange account may get deactivated or you may not have the access to it anymore and thus the OST file turns into a useless object and you cannot use it to get your Emails. It is more useful to know that the only method through which the information in an OST file can be obtained is through the migration of the file to PST, followed by the loading of the content of the file to Outlook.
For this purpose, the best suggestion would be to go for a third-party tool like Shoviv OST to PST converter. This tool will assist you in safe OST to PST conversion with guarantee of folder structure, attachments and other email content. The tool is easy to use, compatible with all the existed editions of Outlook and can effectively work with large and damaged OST files.
As for the emails, it should be noted that, with the help of the specifically designed OST to PST converter, there will be no loss of emails and they will be easily imported into the new Outlook profile or Microsoft 365 account. It is much safer and more effective approach as compared to trying to open OST manually or recreate the Exchange account.