N-series should not even be used in business context or actually it was not designed to be used. e-series is for business usage. This is how Nokia intended this, but (sadly) they didn't probably understand that people who enjoy social media and multimedia capabilities of this device go to also work :|

.edit
If i correctly remember there is some brainstorm about search:
For email:
http://maemo.org/community/brainstor..._email_client/
calendar:
http://maemo.org/community/brainstor...endar_in_n900/