Microsoft Security bulletins have been released for April, 2010.

1. Microsoft Security Bulletin MS10-019 - Critical
Vulnerabilities in Windows Could Allow Remote Code Execution (981210)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-019.mspx

2. Microsoft Security Bulletin MS10-020 - Critical
Vulnerabilities in SMB Client Could Allow Remote Code Execution (980232)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-020.mspx

3. Microsoft Security Bulletin MS10-021 - Important
Vulnerabilities in Windows Kernel Could Allow Elevation of Privilege (979683)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-021.mspx

4. Microsoft Security Bulletin MS10-022 - Important
Vulnerability in VBScript Scripting Engine Could Allow Remote Code Execution (981169)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-022.mspx

5. Microsoft Security Bulletin MS10-023 - Important
Vulnerability in Microsoft Office Publisher Could Allow Remote Code Execution (981160)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-023.mspx

6. Microsoft Security Bulletin MS10-024 - Important
Vulnerabilities in Microsoft Exchange and Windows SMTP Service Could Allow Denial of Service (981832)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-024.mspx

7. Microsoft Security Bulletin MS10-025 - Critical
Vulnerability in Microsoft Windows Media Services Could Allow Remote Code Execution (980858)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-025.mspx

8. Microsoft Security Bulletin MS10-026 - Critical
Vulnerability in Microsoft MPEG Layer-3 Codecs Could Allow Remote Code Execution (977816)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-026.mspx

9. Microsoft Security Bulletin MS10-027 - Critical
Vulnerability in Windows Media Player Could Allow Remote Code Execution (979402)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-027.mspx

10. Microsoft Security Bulletin MS10-028 - Important
Vulnerabilities in Microsoft Visio Could Allow Remote Code Execution (980094)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-028.mspx

11. Microsoft Security Bulletin MS10-029 - Moderate
Vulnerability in Windows ISATAP Component Could Allow Spoofing (978338)

Link: http://www.microsoft.com/technet/security/Bulletin/MS10-029.mspx