AppleInsider reports that Microsoft has today unveiled an official Outlook app for the Apple Watch, which you can use to check, manage and reply to email via the watch.
The app is basically designed to enable the user to browse messages on their watch, either in Glance mode or full mode. Glance mode also provides a list of forthcoming calendar events.
One feature that distinguishes the Outlook app from other email apps for Apple Watch is custom notifications that will highlight the most important messages that the user needs to attend to, and then enable the user to reply to them as quickly as possible via quick actions. These quick actions include rescheduling a meeting, or archiving a message.
The notifications will also show you enough of the email so that you may not even need to open the app.
As far as replying to an email message is concerned, the app has support for voice dictation, emoji, and various stock responses