Outlook CalDav Synchronizer might be a bit more popular than Mailstrom. We know about 1 link to it since March 2021 and only 1 link to Mailstrom. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I know of two. https://mailstrom.co/ https://clean.email/. - Source: Hacker News / over 2 years ago
Here the sync tool: Https://sourceforge.net/projects/outlookcaldavsynchronizer/. Source: over 1 year ago
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