Here’s a list with the Windows Mobile Webcasts for April 2008 (source: Jason Langridge’s WebLog):

TechNet Webcast: Windows Mobile Series: Providing Mobile Access to Corporate Data and Applications (Level 200)
Friday, April 4, 2008
11:30 A.M.–12:30 P.M. Pacific Time

IT Manager Webcast: Windows Mobile Series: Improving Mobile Security and Management (Level 100)
Monday, April 7, 2008
9:30 A.M.–10:30 A.M. Pacific Time

TechNet Webcast: How to Overcome the Top 10 Mobile Device Security and Management Challenges (Level 200)
Tuesday, April 8, 2008
11:30 A.M.–12:30 P.M. Pacific Time

TechNet Webcast: Windows Mobile Series: Device Management and Device Provisioning (Level 300)
Thursday, April 10, 2008
11:30 A.M.–12:30 P.M. Pacific Time

TechNet Webcast: Windows Mobile Series: Top 10 Features for Businesses (Level 200)
Monday, April 14, 2008
11:30 A.M.–12:30 P.M. Pacific Time

IT Manager Webcast: Windows Mobile Series: Why Windows Mobile for Your Business (Level 100)
Tuesday, April 15, 2008
11:30 A.M.–1:00 P.M. Pacific Time

TechNet Webcast: Windows Mobile Series: Messaging and Collaboration for Small and Mid-Sized Companies (Level 100)
Thursday, April 17, 2008
11:30 A.M.–12:30 P.M. Pacific Time

TechNet Webcast: Windows Mobile Series: Get the Facts on Comparing Windows Mobile and Blackberry (Level 300)
Friday, April 18, 2008
11:30 A.M.–12:30 P.M. Pacific Time

TechNet Webcast: Windows Mobile Series: Real-Time Messaging and Collaboration (Level 200)
Tuesday, April 22, 2008
11:30 A.M.–12:30 P.M. Pacific Time

TechNet Webcast: Windows Mobile Series: Microsoft Dynamics CRM Mobility and Windows Mobile (Level 300)
Wednesday, April 23, 2008
1:00 P.M.–2:00 P.M. Pacific Time

TechNet Webcast: Windows Mobile Series: Beyond E-Mail with Windows Mobile for Small and Mid-Sized Companies (Level 100)
Thursday, April 24, 2008
11:30 A.M.–12:30 P.M. Pacific Time

IT Manager Webcast: Windows Mobile Series: The Optimal Mobile Communications Solution (Level 100)
Friday, April 25, 2008
11:30 A.M.–12:30 P.M. Pacific Time

IT Manager Webcast: Windows Mobile Series: Mobilizing Business Processes and Applications (Level 100)
Tuesday, April 29, 2008
11:30 A.M.–12:30 P.M. Pacific Time

IT Manager Webcast: Windows Mobile Series: Mobility Infrastructure Optimization (Level 100)
Wednesday, April 30, 2008
1:00 P.M.–2:00 P.M. Pacific Time