How to delete a file being used by another program Here are some practical ways to dodge the pop-up and delete files that are in use by a program on your Windows PC.

While there are several approaches to managing "in-use" errors in OS X, you can often make use of the Trash to temporarily store these files so as not to disturb your workflow.

Outlook Data File – The file C:\Users\<username>\AppData\Local\Microsoft\<username>\username.ost is in use and cannot be accessed. Close any application that is using this file, and then try again.