Google Android 2.3 User Manual page 150

Gmail
Important messages are marked with a yellow icon:
indicates important messages sent directly to you.
indicates important messages that you were Cc'd on.
indicates important messages that you received as part of a group.
Set Priority Inbox as your default inbox
You can set Priority Inbox as the conversation list to open when you have new mail,
rather than Inbox. This setting is only available in Gmail on your phone if you have
configured Gmail on the web to show Priority Inbox.
1 Open your Inbox, press Menu
2 Check Priority Inbox.
Mark a conversation as important
1 In your Inbox or other conversation list, check one or a batch of conversations that
are not marked important. Or open a conversation that is not marked important.
See "Working with conversations in batches" on page 152.
2 Press Menu
The messages are added to your Priority Inbox and Gmail learns about what
conversations you consider imporant.
AUG-2.3-103
, and touch More > Settings.
and touch the Mark important.
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Android User's Guide