How to Fix “The File Username .OST is in Use & Cannot be Accessed Error”?

We often encounter errors while accessing OST file in Ms Outlook. One of them is getting this error message pop up on our screen "The file username.ost is in use and cannot be accessed" which means the OST file you are trying to open is already used by another program, But this is not the only reason behind this error. Get to know the other issues behind the error and solutions to fix them.

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