Here's a List of Keyboard Shortcuts for theWindows 10 Mail App.

If you're using the Windows 10 mail app withJAWS, here are some keyboard shortcuts to help you navigate the program more efficiently:

Account Manual Sync (Send and retrieve new mail) CTRL+M Or F9
Mark as read CTRL+Q
Mark as unread CTRL+U
Toggle the important property on a conversation CTRL+SHIFT+G
Delete a conversation CTRL+D Or DEL
Archive a conversation BACKSPACE
Reply to current mail CTRL+R
Reply all CTRL+SHIFT+R
Forward current mail CTRL+F
Search CTRL+E Or F3
Create a new mail CTRL+N Or CTRL+SHIFT+M
Add Attachment ALT+I
Send mail ALT+S Or Ctrl + Enter
Accept Meeting Invitation Alt+C
Decline Meeting Invitation Alt+D
Tentative Meeting Invitation Alt+N
Move to View CTRL+SHIFT+V
Switch to calendar CTRL+2
Switch to Inbox CTRL+SHIFT+I
Switch to Outbox CTRL+SHIFT+O
Zoom in CTRL++ (Plus key on numpad)
Zoom out CTRL+- (Minus key on numpad)
Move between regions F6
Toggle Caret Browsing F7