The Symbian eco-system had just started to finally move into Qt as main development platform, Qt on Symbian got PIPS (POSIX compatibility layer), there was the third reboot of the Eclipse based IDE (Carbide), Symbian Java was getting JavaSE extensions, Python and Web Runtime were made available, Symbian Open Source project had just been made available.
So everyone was putting the effort to move away from Symbian C++, J2ME into a more pleasant environment, and then comes Elop with that memo saying to everyone that all their efforts were gone to the trashcan and it was time to embrace Silverlight and XNA instead.
Also from internal point of view, this memo was very bad, because until then Nokia had an heavy anti-Windows culture, and now everyone had to suck it up, leave HP-UX, Linux, Symbian behind and embrace Windows.