Android 2.0 now supports Exchange, though the HTC mods have been supporting Exchange earlier.
But its a myth that Blackberry is about corporate email as Roger states:
"And my personal opinion of ANY black berry is the only reason to ever use one is if you need it for corp email. Otherwise i hate black berry and don't see the love affair with them other than their stellar corp email. But the android is better all the way regardless."
What Blackberry is really good is One) push notification, applied to email, instant messaging and social networking. They are the guys that started the whole ball rolling and created the first social networking friendly smartphones, even with the first Curves. When it comes to email, Nokia, Windows Mobile, and iPhone can match Blackberry, and they now also have push services though Blackberry has been with push so much longer and their infrastructure is much more developed and ever.
And Two) Unified Messaging.
The Blackberry has one Messages Folder, and everything that includes email from different accounts, offline IM from Yahoo, BBM, AIM, GTalk, Live, etc,., notifications from Facebook, App notifications for updates, all fall neatly into one app. When you click on a message, it instantly opens Facebook or Yahoo or the email, depending on its very nature.
Only the Palm Pre WebOS has managed to match this, and take it even further by combining IM and SMS dialog into one seamless application. Kind of a mini Google Wave.
Finally three) Unified Contacts.
From the Contacts book, you can get GPS location, you can SMS, MMS, IM (Yahoo, AIM, GTalk, Live, BBM), email and Facebook the contact directly without leaving the app.
If you are in Facebook for example, you can take a Facebook Contact and added it to the Blackberry Contacts, then send a notification asking for permission to sync the telephone number.
To sum it up, features like these make the Blackberry the first true social networking phones.
The problem is that, now that the competition has a clue, they, like Palm WebOS and Android in particular, are also incorporating these features and then taking them to a new level. Maemo is also incorporating many social networkng friendly features, which is why that platform deserves closer study. iPhone has recently incorporated push notifications, but feels like a hack and still lacks the internal elegance the way Blackberry has been doing. The question for Blackberry is what they have to meet the competition and stay ahead in the social networking area.
For example, note how many are copying the unified Contacts. Palm brought it with WebOS, now HTC with Sense UI, Motorola with Blur and Sony Ericsson with Raphael. Google brings it to the OS level with Android 2.0.
I want to add one more thing. While much has been said about Google Navigation, Google might have another killer app in the making if they get Google Wave a native mobile app for Android.