With the upcoming release of the Zendesk Windows Phone app WP8.1 we will no longer be updating versions WP7.1 and WP8.0.
Users with those versions already installed can continue using them, however there will not be any new features added.
New users looking to install the Windows Phone app not be able to install WP7.1 or WP8.0.
For the best Zendesk mobile experience on Windows Phone, we encourage you to upgrade to 8.1 and check out the Zendesk WP8.1 app.
For any additional questions please contact firstname.lastname@example.org.