Not really. Calendar and email are 2 separate tools that can be bundled together (Gmail) or unbundled (Superhuman for email, maybe Reclaim for calendar).

IM, email, calendars, to-do lists, PM tools... are all orthogonal tools. Great for managers (who need a cross-sectional view of product, tech, ops, sales, marketing, etc). Not so much for "makers" who mostly work in 1-2 tools.