As far as i recall, the OTRS Windows installer also installs cronw, that can schedule tasks in windows in a cron like way.

You can change the schedule in the crontab.txt file in the install directory.

You can also install and configure it manually:
Download from here: http://sourceforge.net/project/showfiles.php?group_id=87160&package_id=106736

I've used the following procedure on a win2k3 server with ActivePerl 5.8 installed:

Extract to C:\Apps\CRONw
Edit "C:\Apps\CRONw\installer.pl":
        Change the line:
                my $command = $PPM.' install -noforce -follow modules\\' . $module . '.ppd';
        To:
                my $command = $PPM.' install modules\\' . $module . '.ppd';
Save and close the file.
Open a command prompt and "cd" to "C:\Apps\Cronw"
Issue the following commands from the command prompt:
        "perl installer.pl"
        "ppm install Text::Glob"
        "perl cronHelper.pl --install"
        "net start cron"

Of course, the OTRS tasks has to be added manually to the crontab.txt if installing it manually.

I have however, later had problems running the postmasterpop3 script from cronw, so i'm just running that as a regular scheduled task. Remaining otrs tasks still uses cronw.

--
/Sune