Microsoft Security Patches for May 2012

Apologies for the late posting of this month's patch post

Yesterday Microsoft released details of the 7 patches that they have released as part of May's "Patch Tuesday"
Of the 7 updates released 3 are critical and 4 important.
 
These 7 patches breakdown as follows:


Critical:

MS12-029: Vulnerability in Microsoft Word Could Allow Remote Code Execution (2680352)
MS12-034: Combined Security Update for Microsoft Office, Windows, .NET Framework, and Silverlight (2681578)
MS12-035: Vulnerabilities in .NET Framework Could Allow Remote Code Execution (2693777)

Important:

MS12-030: Vulnerabilities in Microsoft Office Could Allow Remote Code Execution (2663830)
MS12-031: Vulnerability in Microsoft Visio Viewer 2010 Could Allow Remote Code Execution (2597981)
MS12-032: Vulnerability in TCP/IP Could Allow Elevation of Privilege (2688338)
MS12-033: Vulnerability in Windows Partition Manager Could Allow Elevation of Privilege (2690533)

Note:
MS12-035 has a patch for .NET 1.1 however the following has been added to the FAQ's:
 

Why is security update package KB2604044 not available through Windows Update? 
Security update KB2604044 was previously offered as KB2656353 in MS11-100. Customers who have successfully installed KB2656353 do not need to take any action. Customers who have not installed KB2656353 should manually apply update KB2604044.

Links:

Microsoft: http://technet.microsoft.com/en-us/security/bulletin/ms12-may
ISC: http://isc.sans.edu/diary.html?storyid=13159
 
Regards
Alan

Is it necesary to download and install all of them or only the latest?