scook
If it is out of support then CW needs to update this page http://www.cakewalk.com/Support/Contact and the product drop down on this page http://www.cakewalk.com/Contact/TechnicalSupport

scook is right. The support page specifically lists X3. Whilst it is reasonable for cakewalk to discontinue support for a discontinued product,  given the lack of a statement to that effect I can certainly understand people's frustration at not being able to get a response.
 
Can someone who stated that X3 is no longer supported provide a link to their evidence for this?

Its possible that I am wrong or the page has not been updated. I do believe phone support will continue at least for awhile longer. Because X3 is no longer the current product or receiving updates it also seems reasonable to think tech support is not going to be forthcoming. But the real evidence is the OP has not gotten any support. This could be due to CW being away or that X3 is considered an old out of date product.  

In the old system, as long as the development of a version stopped when a new one came out every year, it would not be too much asked to continue the e-mail support for at least two years after that.
 
The telephone support is no alternative. Many users don't speak english well enough to communicate on the phone, especially because the subject requires very clear and organised expression and terminology.
 
How is it with the present publishing and purchasing formula? Does the support continue for the version (say, Artist) as long as the version name stays the same -  in spite of the update version appendix you have (Manchester or whatever).

I am still not convinced that the lack of response is due to discontinued email support. Given that it was the Christmas/New Year period and now trade show/update and renewal time it is possible that support is simply delayed. I am not saying this is ideal - just possible.

I believe this might clear things up a bit, from http://www.cakewalk.com/Products/SONAR/SONAR-FAQ#start

What is the Technical Support policy?

Active SONAR Rolling Updates Memberships have access to support by both phone and email. If you purchased SONAR with a one-time payment and choose not to renew your membership, you will still receive support by email for one year after your membership ends. Customers who made 12 consecutive monthly payments and choose not to renew will also receive a year of email support.
In the upcoming months we will be launching new Priority Support for active Rolling Updates Memberships, which will mean faster access to answers and more.
Support for SONAR X3 will expire on January 31, 2016. See the SONAR Versions page on Cakewalk.com for discount pricing.

I know the term 'support' means different things to different people. Some feel it means updates/patches others think it means human help. For the purposes of Cakewalk 'technical support' means - will a human assist me.
 
Yes we are still offering technical support for SONAR X3 both phone and email.
 

jason r
5 emails to Cakewalk since December and not one reply!
 

If you haven't already please check your junk/spam folders, that seems like a way worse than average response time. I just poked a support rep on your behalf who will look into it.