Is data encrypted in memory (e.g. if end user opens a Word doc that is encrypted on the device) on the mobile device?
There are Exchange and SCMDM policies that can enforce encryption of data on the device in internal storage and also a storage card. This is actually a Windows Mobile 6 feature – from http://www.microsoft.com/technet/solutionaccelerators/mobile/maintain/SecEntMessaging/4ea10143-5661-45c7-a26b-d01070e3632b.mspx Support for encryption of data stored in removable storage cards. Storage card encryption supports Advanced Encryption Standard (AES) in 128 bit cipher strength.