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If you use FastMail.FM in a work environment, you may get meeting requests sent by Outlook users - previously, you've had to switch to Outlook in order to open these emails.
We've just rolled out a change that allows you to use these meeting invites directly from FastMail.FM. They appear as an attachment to the email, and clicking on the attachment takes you directly to the Outlook meeting request window, with options to accept the invite, reject it, etc.
You still need Outlook installed, of course!