Outlook ICS File Description and Use
The ICS file is used by MS Outlook to create Calendars within Outlook. If you routinely use Outlook to check your email and/or sync your Outlook to a handheld device and want to have all the critical dates and times at your finger tips, download the appropriate ICS files for the days you will be at the event. Each file will create a separate Calendar, so you may want to simply download the Entire Event to have only one Calendar created.
To remove the ICS file after the event simply open Outlook and click on the Folder List icon in the lower left corner of the screen. Next click the plus sign next to your Calendar at the top left portion of your screen. Finally, right click on the Mid America Calendars and select delete.