Here's something interesting that you might find useful about the Windows Mobile business and momentum.

  1. Phones are available from 115 mobile operators in 55 countries 
    • These MOs represent 1 billion+ subscribers, roughly 65% of WW subscribers
  2. 47 Windows Mobile device maker partners
  3. 50+ converged phone designs; 100+ phones shipping worldwide
  4. 100 Windows Mobile multimedia content partners
  5. 18,000+ commercial Windows Mobile applications; 1,440+ certified Mobile2Market applications
    • Line-of-business applications from leading companies such as: SAP, Siebel, PeopleSoft/Oracle, Salesforce.com, Onyx, Microsoft, Sybase/iAnywhere, Dexterra, Mobitor, Field Centrix
  6. 1.5 million+ downloads of Windows Mobile SDKs since January 2002
  7. More than 5 million Windows Mobile ‘connected’ devices shipped worldwide in FY05

That's reason enough to start building apps on the platform. Let me know if you want to find out more about whether you should adopt the Windows Mobile platform.