I’m considering reopening the github issue, as it’s been open for roughly 7 years now (and closed for migration to this community).
Would still love to see this feature.
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Just tried out this e-mail client as an alternative to Thunderbird, but no calendar support is a dealbreaker for me. The Github issue was set as “completed” in 2021 and the “Calendar preview” says the feature is coming this year. I guess this note has been there since 2021, or can anyone confirm it really comes this year?
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In many ways, MailSpring is the best email client out there. However, it does lack some features. The developers of MailSpring haven’t add any features in a long time. Like the rest of us, they need to focus efforts on projects that pay the bills.
I would recommend trying Spark. Google spark for windows if you’re on windows. They also have a client for Mac
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'Hopefully this year" … 2021 
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What about the calendar future?
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Could the devs just come out and say this is dead or what the plan is? Going on 5 years now of “soon”.
I’ve found this, but I don’t see a calendar in the latest version I downloaded today. Any thoughts?
Calendar Release When? · Issue #1790 · Foundry376/Mailspring
Menu/Developer/Calendar Preview
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Thank you! I thought I looked everywhere, but hadn’t 
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Hey folks! The Calendar Preview is coming along, and my hope is that we’ll move it out of preview state in a couple months and integrate it into the app’s main window (ala Outlook). Version 1.18.0 shipped today and includes several calendar-related improvements:
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CalDAV discovery now supports Fastmail, Yahoo, and additional providers (mailsync@e9099ce), so you can view + edit your Fastmail and Yahoo calendars within the app. Note that for FastMail, Mailspring needs to have an “app password” granting it access to Email,Contacts,Calendar, not just Email.
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VTIMEZONE is now included in created calendar events, fixing timezone issues when creating events on Yahoo Calendar (5915e0d)
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An empty state is shown when no CalDAV accounts are connected, making it clearer how to get started (#2625)
Calendar support is still evolving, but these improvements should help users with CalDAV-compatible calendar services. Update via snap refresh mailspring, the built-in auto-updater, or from https://www.getmailspring.com/download.
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HI,
I’m trying this with a Nextcloud Account. Mailspring does not find any CalDaV-Adress, but there is one. Gnome supports Nextcloud. Are you planning to implement Gnome Online Accounts (makes it more easy for Ubuntu Users) or just provide a Input für DAV-Adresses? Thanks for the nice Mailproduct anyway!
Just trying Mailspring for the first time, in my search for a better Linux email client. In that regard, I like it very much compared to Thunderbird. It has a much more modern look and feel, and the mail reading/writing experience is much better. More importantly, it gives me access to all my iCloud mail folders (which Thunderbird does not) and it archives to my iCloud account archive folder, while Thunderbird archives locally (which I really hate).
On the con side, the contacts feature is a bit clunky, although it works. It doesn’t handle company entries (those without a person’s name) well; it just displays a series of semicolons in the contact list. Contact names are inconsistent, some showing First Last, others showing Last, First. Entries with multiple pieces of information (phone, email, address, etc.), as opposed to those with only a name and email address, typically show a series of semicolons after the name in the list. All that said, when a contact is selected all information is displayed properly.
But the biggest con is the lack of calendar integration, as I see has been discussed here for a long time. No doubt it’s easier said than done, but if Thunderbird can do it (which it does very well, actually) surely it’s possible. It’s the one thing stopping me from shifting to Mailspring full time, and it’s something I would pay for the Pro version to get.
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I just posted a question about submitting a PR for a working Google Calendar fork via the Dev category - I don’t have other calendars to try it with and only tested it on Linux, but it’s fully functional, maybe that will get some traction
I also have Calendar working in my fork, but I don’t have hopes of bringing it into the main MailSpring. I don’t know what all it takes yet to make it more official, like renaming, etc. So far it’s just for me and colleagues at the office.
Mine has support for o365, SmarterMail api, CalDav. As you can see, I’ve added a bunch of features.
- Cross account drag/drop
- view folders outlook style. with favorites
- View thread/not, grouped, ungrouped
- Caldav calendar, as well as smartermail API support.
- Office 365 login with oAuth
- Open messages in new tab
- Inline pdf/image previewer
- AI chat (bring your own api key)
- Removed top header to save space
- Modernized context menus
- Sidebar calendar with Day/Agenda view
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That’s awesome, you should contribute it back. The world has been asking for calendar integration for along time.
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I would love to, but I made so many changes, and I don’t have time to human review it, so I’m doubtful it would be accepted.
Second problem is that we don’t know if the maintainer of the project even wants these features. There’s no roadmap, so that’s part of the reason I did my own thing. We really need some guidance as to where this product is headed. In this day and age, anyone can fork and add the features they want. The problem I guess is, it’ll be hard to know what to bring into the main project.
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