Question: Is there a webmail solution that offers AI-powered email composition and integrates with calendar services like CalDAV?

Warmest is a strong contender, with AI-assisted email composition that drafts follow-up emails based on your writing style and the context of a conversation. It also can link to your calendar to send emails at the right time and to create summaries with to-do lists, a feature that can save you hours a week.

Another strong contender is Shortwave, which offers AI-generated full emails, predictive text completion and instant email summaries. It also supports CalDAV integration and has features like email folders and scheduled sending that can help you better organize your inbox.

If you're looking for a tool that's more calendar focused, Dola lets you manage your personal and group calendars through conversational interfaces, including Google Calendar and CalDAV. It can sync across all your devices, so you can keep your calendar up to date regardless of where you are.