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You can check the location of your Outlook Data Office 365 sync problems and login fixes Files in Outlook.
Repair Outlook Data Files (.pst and .ost)
This is all most people will need, searching for older items will be slower but for daily use items it will still be quick. As you close them, lead to the folder and right-click on the OST file. Once you re-open Outlook, your OST file is automatically recreated or rebuilt. If your hard drive goes through any physical damage, it will damage the data across it too. A bad sector or corrupted hard drive can cause OST inaccessibility.
Outlook - OST file recurring corruption
You surely won't be disappointed with the results of rebuilding OST. As you change the extension, relaunch Outlook guide to Office 365 sign-in errors to rebuild your OST file. The first solid question that comes to mind is whether OST files are rebuildable. We are aware that OST files are directly connected to the Outlook email.
If you know the location, click on the "Add File" tab and browse it.If your hard drive goes through any physical damage, it will damage the data across it too.When the case comes to rebuilding the OST file, there are several things to look out for.Find the .ost file that the error message reported to have errors, and then delete it and open outlook, it will recreate a new .ost file.The WebbyAcad OST Recovery Tool offers advanced features to fix damaged OST files and convert them to PST, EML, MSG and other formats while preserving folder hierarchy and metadata.As it is converted, you can easily view the contents of the 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
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 resolve Outlook not sending emails fast 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.