Microsoft recently embedded Live Messenger into Hotmail itself which does make life easy, there are however more ways of accessing Live Messenger without the client. These include:
Web-based Live Messenger on phones
Embedding Live Messenger in your blog/site
- Embed Live Messenger in your Facebook profile
Web-based Messenger for phones:
If you are on a non-WinMo phone that does not have Live Messenger you can access Live Messenger going to the following URL in your browser:
Nokia users can try the Windows Live suite for Nokia, check if your handset is supported.
To embed Live Messenger in your blog:
Tick the checkbox and click Save.
Then click on Create HTML.
Customize as wanted & paste the HTML code in your site/forum signature.
You can see a demo on my Reach Me page.
The above implementation has been introduced as Facebook application & now you can have Live Messenger in your profile itself. Screen shot:
Click here to add the app to your profile.
To access Live Messenger on a PC that does not have it, you can use Hotmail, refer link in the first line.