General commands
| Action | Keyboard Shortcut | 
| Check mail (jumps to Inbox, if you're not already there) | M | 
| Start a new email message | N | 
| Start a new Instant Message (IM) | I | 
| Start a new SMS message (text) | T | 
| Search | S | 
| Display keyboard shortcuts | ? (Shift+/) | 
Composing an Email
| Action | 
Keyboard shortcut | 
| Show Choose Contacts dialog box (from TO, CC, or BCC field) | Right arrow, then Enter | 
| Show BCC field (from CC field) | Right arrow, right arrow, then Enter | 
| Toggle plain text/rich text mode | PC: Ctrl+Shift+Y Mac: Cmd+Shift+Y  | 
| Save as a draft | PC: Ctrl+S Mac: Cmd+S  | 
| Send message | PC: Ctrl+Enter Mac: Cmd+Return  | 
| Attach files (one at a time) | PC: Ctrl+Shift+U Mac: Cmd+Shift+U  | 
| Reply via IM | Shift+I | 
| Reply via SMS (text message) | Shift+T | 
Working with Messages
| Action | Keyboard shortcut | 
| Reply to a message | R | 
| Reply all to a message | A | 
| Forward a message | F | 
| Mark as read | K | 
| Mark as unread | Shift+K | 
| Star a message | L | 
| Clear star | Shift+L | 
| Find a word or phrase in a message | PC: Ctrl+F Mac: Cmd+F  | 
| Print message | PC: Ctrl+P or P Mac: Cmd+P or P  | 
| Delete message | Delete | 
| Add sender to contacts | Shift+A | 
| Open Move menu | D | 
Move message(s) to one of your first 9 folders  | 
D, then 1-9 (For example, type "2" for second folder) | 
| Create a new folder | PC: Ctrl+Shift+E Mac: CMD+Shift+E  | 
| Move message(s) to a new folder | PC: D, then Ctrl+Shift+E Mac: D, then Cmd+Shift+E  | 
| View next message up | Ctrl+, (comma) | 
| View next message down | Ctrl+. (period) | 
Working with Message Lists
| Action | Keyboard shortcut | 
| Highlight the next message up or down | Up and down arrows | 
| Open a message | PC: Enter Mac: Return  | 
Select all messages  | 
PC: Ctrl+A Mac: Cmd+A  | 
| Select messages in a range | Click to check checkbox of first message, then shift-click on checkbox of last message | 
| View or hide Preview Pane (when Preview Pane is enabled) | V | 
Working with Message Lists (when viewing messages page by page)
| Action | Keyboard shortcut | 
Check or uncheck a message's checkbox  | 
Spacebar | 
| Move cursor up or down the list (preserving selection) | PC: Ctrl+up arrow, Ctrl+down arrow Mac: Cmd+up arrow, Cmd+down arrow  | 
Keyboard Navigation and Selection
| Action | Keyboard shortcut | 
| Move cursor to next or previous region of the screen | Tab, Shift+Tab | 
| Move cursor to next or previous toolbar button | Left and right arrow keys | 
| Move cursor to next or previous item in list | Up and down arrow keys | 
| Select item in focus | Enter | 
| Empty Trash or Spam folder (with folder selected) | E | 
| 
Expand or collapse folder list (with "Folders" selected.) | 
Enter | 
| Rename a folder (with mouse or cursor on folder) | C | 
  More shortcuts: In Yahoo Mail, press "?" to see shortcuts for working with Conversations.