Here’s to access iCloud in Outlook: Open Outlook on your Windows, Mac, or mobile device. Navigate to Settings > Add Account > ...
To block emails on iCloud, you'll need to use the iCloud website — you can't use the Mail app on your iPhone or iPad.
You can check your iCloud email on a computer through the Mail app on a Mac or through iCloud's desktop website.
My personal laptop, a PowerBook G4 running Leopard, has my music and photo libraries (and obviously can't do anything with iCloud). My work laptop, however, runs Lion (and might be upgraded to ...