What's the Difference Between Outlook's PST and OST Files? - How-To Geek
https://www.howtogeek.com/690076/whats-the-difference-between-outlooks-pst-and-ost-files/
WEBOct 6, 2020 · 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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