I might be able to help with this!
So, I live in Canada, and recently submitted application to sponsor my wife (who lives in Morocco).
On Page 1 of the application (The Checklist), it clearly instructs you to send to Mississauga if your spouse lives abroad.
However, when you return to the CIC website IN MANY PLACES, it tell you to send application to Nova Scotia if your wife lives abroad.
Now, if you did what I did, and followed the checklist down to the last detail, and already sent it to Mississauga !
So, after I regained composure,
I visited the CIC website, went to the Contact section (you need an UCI or client number or whatever they call it to send a message, but you can just enter 0000000, 0 seven times, it worked!)
After a few weeks, they replied to my worries and said "yes your application has been received, it will be processed in the order you applied, you will be contacted should we require further yada yada yada"
So yes, if your spouse lives abroad, like mine does, I sent to Mississauga, and they received it.
Very stupid that they have conflicting directions!