Besides the bi-weekly Flash, TechNet publishes a monthly security newsletter. The January edition includes a number of interesting articles on mobile security including:

• An article on Secure Mobile Applications by Marcus Perryman
• Whitepaper on securing mobile devices
• Step by Step guide to deployment with Exchange 2003
• Information on remote wipe
• Managing Activesync with policies
• Device Management and Security solutions Guide
• and a number of webcasts on multiple mobility topics

 You can subscribe to it and to most Microsoft email newsletters from the Subscription Center or check the January edition online here http://www.microsoft.com/technet/security/secnews/archive/jan07.htm