Windows Live Messenger 2009 build 3921
| Build of Windows Live Messenger 2009 | |
 Login window | |
| Compatible with | Microsoft Windows |
|---|---|
| Released | 2008-08-23 |
| About | |
Windows Live Messenger 2009 build 3921 is a beta build of Windows Live Messenger 2009, which was released on 23 August 2008. With this build, the version number jumped from 9.0 to 14.0 to correspond with other Windows Live products such as Windows Live Mail.