As usual, here is the information of the bi-monthly cumulative update packages:

 

WSSv3/Moss 2007:

Important: this is a Post-SP3 hotfix. It is highly recommended to first install Service Pack 3 of WSS 3.0 and MOSS 2007 before installing February 2012 CU

WSS (12.0.6661.5000):

KB 2598130  WSSv3 server package (Description)
Download:  http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=2598130&kbln=en-us

MOSS (12.0.6661.5000):

KB 2598129  MOSS server package (Description)
Download:  http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=2598129&kbln=en-us 

As usual:
After installing the cumulative updates, run the SharePoint Products and Technologies Configuration Wizard or
“psconfig –cmd upgrade –inplace b2b -wait” from an elevated command line.

This needs to be done on every server in the farm with SharePoint installed!

For all previous updates and service packs, please see the “Build Numbers and Cube Sheet MOSS/WSS

Individual update packages:  2007 Office system cumulative update for April 2012

Related Links:

Related Update and resource Centers:

More information and Details about SP3 for WSS and MOSS:
http://blogs.msdn.com/b/joerg_sinemus/archive/2011/10/28/wss-and-moss-october-cu-and-or-service-pack-3.aspx

Project Server 2007 (resource center)

April 2012 Hotfix: http://support.microsoft.com/kb/2598131