Calendar in the right panel
In the new version you have starred and contacts on the right side to easily see this information without leaving mail. It would be nice to have calendar there as well to see and make small changes/additions without leaving your email to go to the calendar website. The old version was like this.

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Hi there, the calendar is visible in the right panel. On that side, at the top, you'll see More. When you click on More, you'll see a dropdown with Calendar and Notepad as options. We are aiming to improve the look and feel of calendar so stay tuned!
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Reid A Johannsen commented
i totally agree! add calendar to the right side panel for quick viewing.
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Hi Anthony, thanks for the feedback! Yes, we are working hard to bring you an even better Calendar for desktop and the apps. We will certainly share this with the team, but please know it's in the works. Thanks again!