UPDATE: This method no longer works in newer versions.
Did you know there is an extra hidden tab in Windows Live Messenger Option dialog box? Its called "Add-ins". Its hidden by default. But there is a registry hack available to enable it.

Here is a step-by-step tutorial to enable it:
1. Type regedit in RUN dialog box and press Enter. Now go to:
HKEY_CURRENT_USER\Software\Microsoft\MSNMessenger
2. In right-side pane, create a new DWORD value and give it name "AddInFeatureEnabled" and set its value to 1
3. That's it. Now open Windows Live Messenger and go to "Tools -> Options" and you'll see a new tab "Add-ins".
This article was posted by VG in following section: Windows Live.
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Colly
Works, but i can't seem to add add-ons?
SAM
it was a damn good find..
never seen anything like these before...
post it more if you have anything...
:)
--
SAM
C.E
awesome!... i wished one could add any "add-on". even though the tab is there, the menu itself is disabled. cant add anything. totally cool though,great find !
Jessica
wats a regidit?
VG
^^ Type regedit in RUN dialog box and press Enter. :)
S.
whats a regidit?!?!?
VG
^^ Its Registry Editor. Open Start -> Run and type regedit and press Enter.
jay
not workin on win. live messy
steve
is working la!! stupid
Dex Luther
I don't really understand the huge hype over this. It doesn't really add anything that couldn't be done by using MSN Plus that's been available for years now.