Apple has quietly listed the MagSafe to MagSafe 2 converter as discontinued on the Apple Online Store in the United States and Canada this week. The converter is required to charge a MagSafe 2-equipped MacBook Air or MacBook Pro when the notebook is connected to a Thunderbolt Display or Cinema Display. The converter still appears to have in-store availability, although for how long remains unknown. Apple discontinuing the MagSafe to MagSafe 2 converter would prove problematic for Thunderbolt Display and Cinema Display users. The company does include the converter in the box for the Thunderbolt Display, but not being able to purchase a replacement if you misplace one would be an issue. We have reached out to Apple for comment and will update this story if we hear back. (Thanks, Chris!)