Users see app download message , Default: Yes. If Yes, users will see a message regarding downloading the CRM for tablets app. MS CRM 2013

In MS CRM 2013 in the system setting, general tab, you will find some thing as below

Users see app download message. this means "users will see a message regarding downloading the CRM for tablets app"
default value is yes.

if this is set yes, then if there is a change in server, the below prompt will come on the tab to ask the user...