Hmmm...well, first off, I'm thinking that those "Dear blackberry users" have no way to accomplish what you desire...they are users, after all...not the decision makers at BB.
Secondly, since you ask "when"...the only answer is that no answer can be given. Even if available, providing such forward looking information is not within the Ts and Cs of this site.
If your intent is to ask that BBM be ported to Windows phones, then mission accomplished...request made. But, no answer can be made...the only answer will be when/if it ever happens.
Occam's Razor nearly always applies when troubleshooting technology issues!
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