Problem is ...
Problem is that Microsoft does not understand what business it is in.
You open a whole pile of stores, as Apple has done, because ...
1. you have compelling products that people want to buy, and
2. you're not getting acces to those people.
Microsoft sells primarily to companies, not individual consumers. They're selling we-can-do-it-all infrastructure stuff and Volume Licensing.
Stores in malls are about selling product directly to individuals. To make that work you must have compelling products that those individuals want to touch, try and buy. Sad to say, Microsoft's track record here varies between abysmal and OK. The only "OK" I can recall is Xbox (no flames please - I'm not a gamer) but it seems to have done decently despite the RRoD problems. Kinect is interesting also but I see that as an accessory rather than a product, so I'm not counting it here. For abysmal, the list includes Kin; for bad it's probably Zune.
For Microsoft to open more stores will ...
1. cost a bunch of money
2. expose just how weak their product portfolio really is
Microsoft is trying to generate "Apple buzz" by mimicking Apple's stores. It doesn't work that way. There has to be something that people want to buzz about, and Microsoft just doesn't have it. I'm not sure it ever will but it certainly doesn't look like "soon".
Imitation is the sincerest form of flattery. But Rule #1 of imitation is that you have to do it better than the original (or at least as well in some circumstances). That won't happen here.
I think that Microsoft's Board or Directors has taken leave of its senses. There's no strategy to follow the success of the Win/Office franchise and they have Steve Ballmer in place to execute. Bad plan, folks. Bad plan.