Timeline: 5 years
Ok, this is a pretty bold prediction, but one that has been discussed a lot.
Google and Apple have been eating away at RIM's (or "Blackberry" as most people know them) market share slowly but surely.
Microsoft, meanwhile, knows that the future is all about mobile, but has failed over and over again in this realm.
Have a look at the graph here: http://tech.fortune.cnn.com/2010/07/08/latest-comscore-data-android-market-exploding/
So the great MBA logic here will be to combine the two, and take advantage of "synergies."
It sort of makes sense, considering there is a huge link between RIM and Microsoft. They are both very "corporate" and their products are often maintained by the same IT department.
Bonus prediction: Synergies aside, the merger will slow down and hurt both companies, and their market share will fall even faster.