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You can check the location of your Outlook Data Outlook Not Sending or Receiving Email Files in Outlook.
Repair Outlook Data Files (.pst and .ost)
An Outlook data files are designed to safely handle max space 50GB in Outlook 2010 to 2019 and Office 365 by default. You can try syncing outlook file 6 to 12 months or through archiving email using retention policy, could be a better way to protect the .ost size from corrupt. As it is converted, you can easily view the contents of the data file.
Outlook - OST file recurring corruption
The functionality is diverse, and it can be approached in multiple directions. When the case comes to rebuilding the OST file, there are several things to look out for. If flush dns and re-Sync Outlook you can open the original Outlook Data File, you might be able to recover additional items. The Inbox Repair tool creates a backup file with the same name as the original, but with a .bak extension, and saves it in the same folder.
Open the OST file as per the location provided in the table.Convert your OST to PST for optimal results if rebuilding the OST file does not do the trick.The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape.You can try syncing outlook file 6 to 12 months or through archiving email using retention policy, could be a better way to protect the .ost size from corrupt.As you said Outlook E3 licenses should support at least 100GB of data & there’s no excuse why it can’t support OSTs above 50GB when they offer twice that space.The Inbox Repair tool creates a backup file with the same name as the original, but with a .bak extension, and saves it in the same folder.You can use the Inbox Repair tool (SCANPST.EXE) to diagnose and repair errors in your Outlook data file.
What are the major Reasons of OST Corruption and how to Fix it
Confirmed user can log on to OWA (Office 365 webmail) without issue. Upon starting Outlook, error message displayed is "Errors have been detected in the file ," then prompt appears to locate (not fix) the OST file. Outlook 2016 connecting to Office 365 E3, mailbox size ~55GB and Outlook reghack effected to allow for ~80GB OST. If your computer faces unnecessary power outages during a process, it can be damaging.
Method 4: Use OST Repair Tool
This article has provided an overview of how you can quickly rebuild an OST file. With the methods and Wondershare Repairit for Email, you can make cohesive use of the available resources. Get your OST rebuilt properly with Outlook data file cannot be accessed the help of the available techniques.