I just purchased the M200i, and would like to join a forum with other users. 
Here I find V-Studio forums but nothing for the M200i. 
 
When I search in Google, I don't find any M200i forum. 
 
If there is not an official Roland M200i forum somewhere else, can we create one here?  I already come here for Sonar, and it's all Roland products, right?
 
 

Unlike the V-series (which bundle versions of Cakewalk software), the M200i is not a Cakewalk branded product. If there is a forum it would be at Roland.

I still have not found a forum for the M200i.  Could you clarify exactly where you mean by "at Roland"?  The M200i is at the product site http://www.rolandsystemsgroup.com. As far as I can tell there are no forums there. Are there other Roland sites that might host the forum for the M200i?
I found www.rolandforum.co.uk, but they have gone "offline".  No forums are found at http://www.rolandus.com as far as I can tell.
 

www.rolandforum.co.uk seems to be live from where I am in the UK. Most recent posts are dated 3rd September 2013.
 
This forum is a  peer-to-peer one for users of Cakewalk's products, not a general Roland one. If you've a question you could try asking in the non-Cakewalk hardware section of this forum, but whether anyone here would know enough to answer you I've no idea.