Skype app is no longer available to the Nokia Lumia 610 since the experience wasn't 'up to par'

Initially, Nokia said that Skype for Windows Phone would be compatible to work with the Lumia 610 – despite its less than generous 256MB of RAM. Well, it seems that the case isn’t so anymore, as Nokia has been convinced that the app is absolutely incompatible to run on low-memory totting Windows Phones.
Nokia attaches great importance to the launch of products and services to bring the user experience, so even if the Skype Windows Phone version on the Nokia Lumia 610 does, but after intensive testing, we found the user experience does not guarantee to Nokia and Skype the expected level. Therefore, we do not recommend users to use Skype on the Nokia Lumia 610. Nokia Lumia 610 users in the Windows Phone Marketplace will not be able to download Skype, Windows Phone version. Skype, Windows Phone version will continue to open to other users to download.