If you are using Office 365 operated by 21Vianet, you can use Microsoft Exchange ActiveSync devices or an offering from Research in Motion (RIM, the BlackBerry wireless email solution) to run Blackberry Enterprise Server (BES).
BlackBerry® smartphones can access email and documents in Office 365.
BlackBerry® 10 smartphones with Microsoft Exchange Online
BlackBerry 10 smartphones can connect to Exchange Online directly using Microsoft Exchange ActiveSync.
For more information, see Set up email on a BlackBerry.
BlackBerry® 7 and earlier smartphones with Microsoft Exchange Online
You can use the BlackBerry® Internet Service (BIS) to connect BlackBerry 7 and earlier smartphones to Exchange Online. BIS allows BlackBerry users to access their email accounts over the Internet through IMAP or POP.
Most mobile operators have BIS set up. End users will need to configure email, calendar, and contacts synchronization by using the instructions in the following Knowledge Base articles:
Users who connect to their accounts using IMAP or POP connections can synchronize their email only by using a wireless connection. For information about how BIS users can use a wired connection to synchronize the contacts and calendar between their BlackBerry smartphones and their accounts, contact BlackBerry support.
BlackBerry smartphones with SharePoint Online
For Microsoft SharePoint Online access, BlackBerry users can use the native browser on their BlackBerry smartphone to access SharePoint Online sites. BlackBerry users can view Word, Excel, and PowerPoint documents using Office Online rendering in the mobile browser.
To view feature availability across Office 365 plans, see Office 365 Platform Service Description.