144 Email
Do one of the following:
While reading a message, touch the star in its header.
When viewing a conversation, touch its star to start the newest 
message in the conversation.
To unstar a message, touch its star again. You can also touch a star in 
a conversation list to unstar all messages in the conversation.
Labeling a conversation
You can organize conversations by labeling them. Gmail/Google Mail 
has several preset labels you can use, and you can also add your own 
labels, using Gmail/Google Mail on the web.
While viewing the messages in a conversation, press MENU and 
then touch Change labels.
Select the labels that you want to assign to the conversation, and 
then tap OK.
Viewing conversations by label
You can view a list of the conversations that have the same label.
When viewing your Inbox or another conversation list, press 
MENU, and then touch View labels.
Touch a label to view a list of conversations with that label.
The conversation list resembles your Inbox, but the label replaces 
“Inbox” in the title bar. You work with labeled conversations lists in the 
same way as with your Inbox.
Changing Gmail/Google Mail synchronization settings
Press HOME   , and then tap   > Gmail/Google Mail. 
Press MENU, and then tap Settings > Labels.
To set the number of days to synchronize, tap Number of days to
sync.
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