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I’ve used the repair tool when this started and it did not really repair the file. I used the following combination of techniques to get the user working. In the rebuild Outlook data file quickly Folder Pane, you might see a folder named Recovered Personal Folders that contains your default Outlook folders or a Lost and Found folder.
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
Although the repair process might recreate some of the folders, they may be empty. The Office 365 sync problems and login fixes Lost and Found folder contains any folders and items recovered by the repair tool that Outlook can't place in their original structure. You can use the Inbox Repair tool (SCANPST.EXE) to diagnose and repair errors in your Outlook data file.
Once you re-open Outlook, your OST file is automatically recreated or rebuilt.The Lost and Found folder contains any folders and items recovered by the repair tool that Outlook can't place in their original structure.To execute this, you need to have a good tool with yourselves.OST file corruption is a common problem faced by Outlook users like you.Any MS techs can contact me if they need further information or analysis.You might be working on something important across it when it happens.Only way to restore Outlook 2016 (Windows) functionality was to create a new profile; this worked, and a new OST file was created.
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
Only way to restore Outlook 2016 (Windows) functionality was to create a new profile; this worked, and a new OST file was created. On the next screen, access the "Find File" option if you are unaware FixTechGuide Outlook repair tutorial of the location. If you know the location, click on the "Add File" tab and browse it.