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To set synchronization for a particular label, tap the label. You 
can select to synchronize the default number of days, or you can 
sync all or none of the label’s messages.
Working with conversations in batches
You can archive, label, delete, or perform other actions on a batch 
of conversations at once, in your Inbox or in another labeled list of 
conversations.
In the Inbox or other conversation list, select the check boxes for 
the conversations you want to work with as a batch. When you 
select a check box, the Archive, Labels, and Delete buttons are 
displayed at the bottom of the screen.
Tap the Archive, Labels, or Delete button to perform one of those 
actions on the batch of conversations, or press MENU for more 
options.
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