Mark unread messages as read when viewed
Update the status of an unread message when it is selected in the Message Center or opened by an Incoming Message trigger.
Display SMS usage info when editing messages
The SMS Character Counter displays information on the length of your message that you may find useful if you are charged per-text message.
Store sent messages on my computer/on my phone
Sent messages are stored on your computer by default (and not in your phone's sent folder) in order to preserve accurate message dates.
Moving to local folder sets empty date to current
Current date is inserted for missing dates when moving messages to a folder on your computer.
Folder totals include only unread messages
Display the number of unread messages to the right of folder names, instead of the total number of messages in the folder.
These options determine where the Message Center displays messages on devices. Either option or both options may be selected. The options are accessible from the Message Center tab of the preferences, the Messages menu in the menu bar, and the options menu in the message folder list in the Message Center.
Show as sub-folders of Inbox, Sent, Drafts
Add device folders under each of these three main folders. Use the main folder's disclosure triangle to show or hide the device folders. Selecting a device folder displays messages on the device that match the message state that the parent folder uses.
Show as separate folders
Add device folders as main folders at the end of the message folder list. Selecting a device folder displays all messages stored on the device.