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There may be items in the backup file that you might be able to recover that the Inbox Repair tool couldn't. Open the OST file as per the location provided in the table. As you open it across the File Explorer, lead to the "View" menu from the top. There, turn solve Office 365 mailbox sync delays on the option of "File Name Extensions" to display extensions.
Repair Outlook Data Files (.pst and .ost)
Click the "Data Files" tab on the window and select your respective OST file. Click the "Open File Location" button to lead to the folder automatically. Outlook OST is directly connected and synchronized to the email client. If the problems occur across the synchronization of the OST file, it would be damaging. The file would get inaccessible and won't update in any case. To the ones that said 50Gb are more than enough for most people,… well we are in 2020 & I can assure you that more than half of the accounts we manage are way above 50Gb, close to 100Gb actually.
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 resolve Outlook not sending emails Fast 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.
Get your OST rebuilt properly with the help of the available techniques.There may be items in the backup file that you might be able to recover that the Inbox Repair tool couldn't.Also, I forgot to mention that normally when the OST is corrupted you normally delete the file and recreate it.You could Right-click the Start button, and click Run, type Outlook.exe /safe, and click OK.Click the "Data Files" tab on the window and select your respective OST file.In addition, you could open outlook in safe mode, maybe some add-ins affect the outlook.Confirmed user can log on to OWA (Office 365 webmail) without issue.Click the "Open File Location" button to lead to the folder automatically.
What are the major Reasons of OST Corruption and how to Fix it
Fwiw, responding to my original post and how we addressed it for this user - we ended up creating new Outlook profile and limiting the amount of cached mail to 2 years. If the OST still gets corrupted when you have reduced the size there is something in the mailbox causing the problem. You must re-select "Account Settings" when it opens across a drop-down menu. There, lead into the "Data Files" tab and select your OST file. After selecting the file, click on "Open File Location" to redirect to the folder.
Method 4: Use OST Repair Tool
In certain cases, you must go for other methods to recover the data across OST files. If the respective file is not rebuilding from the above methods, there are other ways to get its data. This can be done with the help of PST files, another Outlook data file form. While they act as the basic backup data file for the user, the OST file connection status shows disconnected can be easily converted to this form. Also, I forgot to mention that normally when the OST is corrupted you normally delete the file and recreate it.