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XstReader
Xst Reader is an open source viewer for Microsoft Outlook’s .ost and .pst files, written entirely in C#. To download an executable of the current version, go to the releases tab.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
xstreader/export is the only free one that I know but it doesn't export to pst
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Hence, a higher number means a more popular project.
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