Follow along with the video below to see how to install our site as a web app on your home screen.
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CalDav has to be supported by the Mail Server you've installed. The support of this feature is dependent on the Mail Server software. I imagine this might not be supported in the free/lite versions of the mail servers that ship with Plesk and you'll need to purchase the full versions. Discover what Mail Server (and version) you're using and then research whether CalDav is supported.