BlackBerry has updated their Work Drives application to v2.0 today for devices running OS 10.2+. This new version extends the application to allow remote file access to SharePoint sites. This is on top of the network drive access they had in the previous versions. Sadly you still need BlackBerry Enterprise Server 10.2 to use the network shares even though BlackBerry could easily expand the user base for the application by allowing all users to mount network drives.
Check out the new version of Work Drives in BlackBerry World.