You can schedule a single folder to replicate as often as
necessary to ensure that all replicas remain current. A schedule
set for a specific folder overrides the schedule set for the parent
folder and the schedule set for the database.
On the Start menu, point to
Programs, point to Microsoft Exchange, and then click
System Manager.
If administrative groups are displayed, expand
Administrative Groups, and then expand the group you want to
work with.
In the console tree, expand Folders, and then expand the
folder hierarchy for which you just created a store.
Right-click a folder, and then click Properties.
Click the Replication tab.
Under Public folder replication interval, select Use
custom schedule, and then click Customize.
In the Schedule window, click Selected times.
Click the time on the grid to specify when replication of this
folder will take place. Click OK to save your settings.