Unknown error after upgrading Windows

[StephenSs]

Hello community.
After upgrading to Windows 10 i cannot open OST extension file which is on my flash drive.
A warning message: "Unknown error"
How can i remove the error or what should I do? Any suggestions ideas would be great.

[ander]

Have you just been trying to open the file from within Outlook?

Maybe your file association is broken for .ost files. Try right-clicking the file, pointing to "Open With...", then clicking "Outlook" in the list. (If Outlook isn't in the list, click "Choose Default Program..." to find and select Outlook.

[microsoft windows]

NO ONE NEEDS WINDOWS TEN. GO BACK TO WINDOWS NINETY-EIGHT.

[rob292]

OST is a cache file that syncs outlook with the mail server. It is created when you setup your account in Outlook.You can export your email account (OST) to a PST in Outlook under import/export options. Also you can try to open the file here: https://www.viewertool.com/ostviewer.html

[SpAmRaY]

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