Access Microsoft Online Services, Exchange Online and SharePoint Online with your smartphone; almost any smartphone that is, including the BlackBerry.
For “pushmail” (email, calendar, contacts, tasks) with Exchange Online there’s a great overview of the different vendors supporting Exchange Active Sync (including Nokia, Apple and SamSung)
… In an increasingly mobile world, more employees need seamless access to more types of communications and collaboration information—including e-mail, calendar, contacts, tasks, and shared content—from virtually anywhere, at any time. Microsoft Online Services includes two services which can be accessed through mobile phones: Microsoft Exchange Online and Microsoft SharePoint Online. Both Exchange Online and SharePoint Online can be accessed through a variety of devices: Windows Mobile 6.0+ devices, Exchange ActiveSync devices, and RIM BlackBerry devices.
See solutions for each device type:
Source: Microsoft Online Services