If you open MS Outlook and see an error message, Outlook is using an old copy of your Outlook data file (.ost), then use ...

Forbes contributors publish independent expert analyses and insights. Davey Winder is a veteran cybersecurity writer, hacker and analyst. Update, July 30, 2025: This story, originally published on ...

Microsoft Outlook stores data in a Personal Folders, or PST, file; the file contains messages, contacts, notes and other information found in your Folder List. The email client allows you to export ...

There are loads of file types swimming around our computers at any given time — most of which exist to supplement the programs we use or play (or allow them to function in the first place). The most ...