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Microsoft Outlook stores your emails, tasks, and appointments as either PST or OST files. These both do the same basic job. However, there are some differences that are important, depending on whether you want to backup, restore, or move your data.

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Source: https://www.howtogeek.com/690076/whats-the-difference-between-outlooks-pst-and-ost-files/
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The Article Was Written/Published By: Rob Woodgate