before i upgrade,
this i'd like to know.
 
i have many older mixed projects that are unfinished, done in sonar 6 professional edition

The cwb format is still supported. The best thing to do is try the demo. It will require a machine running a newer OS than XP. If the bundles/projects were built on a 32bit platform using DX plug-ins, it will be necessary to open them in 32bit SONAR or the plug-ins will not be loaded.

Also, "correctly open" involves having all the same plugins installed. 
If you upgrate your computer, older plugins that came with 6PE will not be included in Professional.
You would need to install both Sonar's to use the exact same plugins, otherwise you can just delete them and use current plugins instead. 

also, iirc, bun doesn't include... automation? something like that, there's something bun format leaves out

Are you confusing Audiosnap with automation? Bundle files do not store Audiosnap data. Was Audiosnap around when Cakewalk DAWs used the bun extension?

Yes I am, I knew it began with an "a" thanks for correcting me :-)
edit: i also mean cwb not bun, i should probably just stop now

Was audio snap in v6?

I think it was the first version to have it

It should be no problem, I have opened cwb files from Sonar 1.
 
Rocky

scookI think it was the first version to have it

 
*sucks teeth*