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Set-OutlookSignatures
The open source gold standard to centrally manage and deploy email signatures and out-of-office replies for Outlook and Exchange
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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.
Set-OutlookSignatures - Doesn't seem reliable. I had it fail for some mailboxes and couldn't figure out the reason for the errors "mailbox does not exist". It's decently documented, but it's OSS after all with no real support.
NOTE:
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Hence, a higher number means a more popular project.