Under Windows 10, whether you are using Outlook 2016 or a previous version, the application stores a copy of your email, contacts and calendar in two different data files, depending on the type of offline access account.
If you use an IMAP or POP account, such as the one provided by your Internet Service Provider (ISP), your account information is stored in an Outlook data file (PST). However, if you use an Office 365, Exchange or Outlook.com account, the data is stored in the offline Outlook data file (OST).
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