We are receiving "The iTunes Store is unable to process purchases at this time. Please try again later." message whenever we try to update apps or purchase new apps. This is on two separate iPhone4s running 4.3.3. I haven't updated the iOS this week because I'm still working on resolving a separate issue, syncing playlists back to iTunes from the iPhone after a Snow Leopard restore. FWIW-- The Mac Store on my MacBook also returns a similar error message when I try to update pixelmator and evernote. I get "The iTunes Store is unable to process purchases at this time. Credit card processing is temporarily unavailable. You may continue to browse the store. Please try to make your purchase later." After that error in the Mac Store, I immediately get the following error message: "We Could Not Complete Your Request. There was an error in the App Store. Please try again later. (100)"