I just discovered that the latest version of Windows Live Messenger (WLM) supports multiple instances. That means, we don’t need any third party tool to crack it.

The support for multi-WLM i s not enabled by default, but can be easily turned on and enable with registry hack.

1. Go to Start -> Run
2. Type regedit and hit enter
3. Navigate to the following registry key: KEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Live\Messenger (For 64-bit x64 OS, go to following registry branch instead: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Live\Messenger)
4. In the right pane, right click on any blank space, select New on context menu, and then click on DWORD Value
5. Name the registry value as MultipleInstances with a value 1
6. Close Registry Editor

Start as many WLM instances as you wish. Its handy when you want to run an office and personal id at the same time.