Microsoft Outlook uses two file types for holding message, calendar, task and notes data: PST and OST files. PST files are created in the user's computer for non-Microsoft Exchange accounts ...

While using Outlook, users get a 20MB cap on the file size of their attachment, i.e., a user can only mail file(s) as big as 20MB in one email. This size limit has been seen even with the latest ...

Just note that these are reserved mainly for the desktop version and don't include your Chromebook (your Chromebook relies on Outlook.com). But what happens if these files become compromised ...