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

OST (Offline Storage Table) files are Microsoft Outlook data files that store an offline copy of your mailbox data, such as emails, contacts, messages, notes, etc. While you can access and view OST ...

Microsoft uses file associations to set default programs for opening different file types on all its operating systems. As a result, when you open a file, be it text, image, or document, on your ...

Spreadsheets created in Apple Numbers can be wondrous things, but opening them in Excel on a Windows PC is something of a headache. It can be done, though, with a little help from iCloud. In this ...

The original proposal for the World Wide Web, written by Tim Berners-Lee in 1989, is an important piece of internet history. It also can't be opened on modern computers. John Graham-Cumming, a British ...