Guides

• How do I add an add-to-calendar link to an email?: How to put add-to-calendar links in Gmail, Outlook and Mailchimp emails, why JavaScript buttons fail in email, and links vs .ics files.
• What is an .ics file and how does it work?: What an .ics calendar file is, the required fields under RFC 5545, a minimal valid example, time zones, recurrence, and why downloaded events don't update.
• Why do add-to-calendar buttons break in Outlook?: Why add-to-calendar links fail in Outlook desktop, web and mobile: wrong deeplink host, time zones, all-day dates, .ics encoding and line endings, with fixes.