Gmail 139
T-Mobile G2 User’s Guide
A dialog for that conversation label opens, with three options:
Sync none Don’t download any conversations that have only this
label.
Sync 4 days Download the previous 4 (or number of days you set)
of conversations.
Sync all Download all conversations with this label.

To set how many days of conversations to synchronize

1Open your Inbox.
2Press Menu and touch More > Settings > Labels.
3Touch Number of days to sync.
4Enter the number of days and touch OK.