This policy setting allows you to limit the amount of e-mail history that is synchronized with the device. On the device, ...

"This policy setting allows you to limit the amount of e-mail history that is synchronized with the device. On the device, the user can choose to download all messages within a specified time period, such as one day or two weeks. This policy sets the maximum time period that the user can select. In addition to this policy, for security purposes you may want to have e-mail messages older than a specific number of days automatically removed from the device.  If you enable this policy setting, then you can specify the maximum time value that the user can select for downloading e-mail messages.  If you disable or do not configure this policy setting, then the user is not restricted in the time values that can be selected."
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