Apps you previously had INSTALLED on your Windows 8 computer will still be there once you upgrade to Windows 8.1. Some Start screen apps, LIKE Mail and CALENDAR, will be updated automatically when you upgrade. You will also need to reinstall any apps you previously downloaded from the Windows Store.

If you're upgrading from Windows 7, your apps should still be there after you upgrade. If you're upgrading from an OLDER version, such as Windows Vista or earlier, you will need to reinstall your old apps.

Apps you previously had installed on your Windows 8 computer will still be there once you upgrade to Windows 8.1. Some Start screen apps, like Mail and Calendar, will be updated automatically when you upgrade. You will also need to reinstall any apps you previously downloaded from the Windows Store.

If you're upgrading from Windows 7, your apps should still be there after you upgrade. If you're upgrading from an older version, such as Windows Vista or earlier, you will need to reinstall your old apps.