HTC DROID Incredible - Manual (Page 148)

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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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