Only way I see is if you had a backup (disc image) that you can restore from.
With a power outage, anything can be corrupted it can even cause hardware failures.
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There is an inbox/pst/ost repair tool built into Office you can try.
Beware replies with links to "online office repair" tools - these are generally just phishing attempts to obtain personal information. Proceed with caution using anything other than the Microsoft built-in tools.
For the OST file related issue you can read the below-mentioned article. These articles will help you to understand how can you repair your OST file and even how to migrate OST data to office 365.
I hope this will work for you.