Starting from Summer ’15, Salesforce will end their support for Microsoft IE 7 and IE 8 for Salesforce.
2. Microsoft IE 7 and IE 8 are less secure.
After Summer ’15, new features will no longer work in these features.
Why Microsoft IE 7 and IE 8 will not be supported?
1. Microsoft IE 7 and IE 8 is not HTML5 compatible.
2. Microsoft IE 7 and IE 8 are less secure.
Cheers!!!