InnoPath Software, which specialises in over-the-air customer care for mobile devices, led the first ever OMA-DM (Open Mobile Alliance Device Management) interoperability demonstration at the OMA's recent meeting in meeting in Boston. The company successfully demonstrated its next-generation OMA-DM ActiveCare server, with handsets from Nokia running Symbian S60, and from HTC running Windows Mobile 6.1, highlighting interoperability across devices and networks, as well as broad industry support. With Smartphones costing up to four times as much to support as traditional featurephones, InnoPath says the ability to effectively support these advanced devices validates its ActiveCare business model for operators, and is proof of the utility and deployability of OMA-DM standards. This tie between standards development and practical use is critical for network operators and device makers.
The demo included four key OMA-DM enabled care capabilities:

• Mobile Check, where the phone is pulsed for vitals. This capability is based on the Connectivity Management Object 1.0 (Approved Enabler) and Diagnostics Monitoring 1.0 (draft).
• Mobile Check and Correct for both ActiveSync and public email, saving up to 14 minutes on email support calls. This capability is based on Device Management 1.2 (Approved Enabler).
• Mobile Software Management for lifecycle software management, permitting operators to play a vital role in the application delivery ecosystem. This capability is based on the Software Component Management Object 1.0 (Candidate Enabler).
• Mobile Lock and Wipe for securing the phone. This capability is based on the Lock and Wipe Management Object 1.0 (Candidate Enabler).

The Nokia E71 is a leading smartphone based on Symbian and now available from AT&T (E71x). It runs a Native OMA-DM client. The HTC Tytn II (aka AT&T Tilt) is a widely available Windows Mobile phone, and was demonstrated with InnoPaths standards-based ActiveCare Client. This client is unique in that it may be loaded onto the phone by the handset vendor or pushed to the phone once it is in the hands of the subscriber, allowing network operators to manage devices that may not have left the factory with device management clients installed.
You can see the OMA presentation on OMA presentation on the interoperability demonstration here.  
You can see a video of the HTC/Windows Mobile component of the demo here. And a video of the Nokia/Symbian component of the demo here.