When trying to create a new Force.com project , I am getting a weird error :

Invalid Api version specified on URL

I have tried using Eclipse - Juno and Kepler. I suspect issue might be because of the IDE version 31.0 
Have followed every single step provided in the below link
https://developer.salesforce.com/page/Force.com_IDE_Installation

Hello Fellow Developers, 

My team had created a huge application which is currently being used by more than 100K customers in Toronto region. 

For Website - .NET/Sharepoint
For ERP - Dynamics AX
Database - SQL 
Integration - BizTalk

Other day client has given a task :) stating that they need to migrate atleast few modules into Salesforce. 
Where do I start ? If you all out here help me with with few ideas , I will try to work out with my team. 

Thanks for the help in advance. 

Hello Fellow Developers, 

My team had created a huge application which is currently being used by more than 100K customers in Toronto region. 

For Website - .NET/Sharepoint
For ERP - Dynamics AX
Database - SQL 
Integration - BizTalk

Other day client has given a task :) stating that they need to migrate atleast few modules into Salesforce. 
Where do I start ? If you all out here help me with with few ideas , I will try to work out with my team. 

Thanks for the help in advance.