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Sync is for the sync to a pc or other device connected using LINK.
The provider will forward any messages once the phone is powered up unless the options are set as suggested below.

Account configuration:

Sync interval: This setting specifies how often the BlackBerry Hub application will ask for new items (Mail, Calendar, Contacts Memo/Task if available for integration type).

Use push if supported: If your account supports a protocol that supports push (IMAP, MS ActiveSync, etc) the email server will alert the application when new mail is available as opposed to waiting until the next scheduled time (Sync interval). This will be enabled by default if the integration type supports push.

Email sync timeframe: Adjusting this setting controls the amount of mail that will be pulled down from your account to the application. All mail within the inbox, and any selected subfolder(s), within the chosen timeframe will be synchronized to the device.

Note: If the Email sync timeframe option ;Forever; is selected a very large amount of email could be retrieved from the account. This can cause the following:
Delays in email synchronization
Noticeable delay in application performance
Less than optimal battery performance
The device may operate at a warmer temperature while synchronization is occurring
These symptoms are typically seen when selecting the forever option with a large mailbox. However, an extremely large mailbox may cause the same symptoms to be seen with another smaller timeframe selected. If you are noticing the issues described above you may want to decrease this setting to a smaller time frame.

Calendar sync timeframe: This functions in the same way as the Email sync timeframe.

Create a Home screen shortcut: This is enabled by default and adds a shortcut, specific to this account, to your home screen

Notify me when an email arrives: This setting controls whether or not you will be alerted when a new message arrives. Each account that has been added to the application can be individually configured to alert how you would like it.