From Hostek.com Wiki
Will my site work with ColdFusion 10 or ColdFusion 11?
- In most cases, yes, without any changes. We have migrated thousands of sites from ColdFusion 6, 7, 8, and 9 to ColdFusion 10 and/or 11 and have only seen a few sites that did not work without some minor changes.
- We have been able to work with the developer and site owners to get the needed changes made to their application. If the changes are fairly small and don't require a whole lot of time, we have provided this service for free. We want you on the latest ColdFusion versions for your security.
Key Reason to not use ColdFusion 9
- Adobe is no longer providing security updates for ColdFusion 9. ColdFusion 10 and ColdFusion 11 have been out for a while now. No fault to Adobe here. That is the general process of software.
Other Important Reasons to not use ColdFusion 9
- Vulnerabilities exists in ColdFusion 9. Protect yourself!
- You should stay current with software.
- ColdFusion 10 is faster than ColdFusion 9 and ColdFusion 11 is faster than ColdFusion 10.
- Newer versions will have more features.