If you want to schedule Exchange PowerShell scripts, you can easily add the Exchange 2010 PowerShell snap in your script & run your Exchange script.
To convert your PowerShell into Exchange Management Shell, try this:
Open PowerShell and type the following command.
Add-PSSnapin -Name Microsoft.exchange.management.powershell.E2010
Add the above Add-Snapin cmdlet start of your Exchange script. You can schedule the script to run Task Scheduler.
Hope this is useful for you.