Microsoft has finally said good bye to his old friend classic client. 🙁
Microsoft Dynamics NAV 2009 was the last version which had classic client and after 2009 version Microsoft moved with RTC and web client by dropping classic client. I can confidently say that many of us including myself loved the classic client even though it does not look hot like RTC. 
However after January 13, 2015 Microsoft will stop its mainstream support for Microsoft Dynamic NAV 2009 versions (2009, 2009 R2, 2009 SP01).
Customers who are current on a service plan can continue to access the following benefits through CustomerSource:
- Previously released Upgrades, Updates, Service Packs, Fixes and Regulatory/Tax Updates
- Self-Help Support through Knowledge Base articles and online content
- Unlimited Online Training
This is the Microsoft’s way of saying, get upgraded to new version!
You can find the source document in here
Thank you and Regards,
Tharanga Chandrasekara