MSN® Messenger version 4.0.1 for Mac makes it easy to take advantage of the full power of instant messaging. By using MSN Messenger, you can see when your friends, family, and coworkers are online and then communicate with them instantly. MSN Messenger can also notify you when new messages arrive in your MSN Hotmail® Inbox, if you have a Hotmail account, and provide the latest news and headlines from MSN. And perhaps best of all, it's free!
What's New:
View: MSN Messenger Homepage
Download: MSN Messenger Version 4.0.1 for Mac
News source: Microsoft Download Center
What's New:
- Office 2004 Integration: Use MSN Messenger to see if other team members are online, initiate an instant message conversation with them from within your document, then save it as part of your project file.
- New Standard Emoticons: Let your friends know how you really feel with a wider selection of standard emoticons. MSN Messenger for Mac includes all the standard emoticons available in Windows® Messenger 6.0.
- Improved Alerts: Reduce screen clutter and act on information instantly with a single mechanism that handles .NET, MSN and Office alerts.
- Improved File Sharing: Eliminate file-sharing hassles when exchanging files across a corporate firewall.
- Spam Filter: Reduce the number of unwanted instant messages you receive from strangers.
- Integration with Entourage 2004 E-mail: Start a new instant message conversation with people in your Address Book, or view a recent one, by clicking the Messenger icon on their contact card.
- Hotmail Support: Use MSN Messenger for Mac to view your Hotmail account now that the Address Book functionality has been updated.
System Requirements
- Processor: Power Mac G3, G4 or G4 Cube, G5; iMac; PowerBook G3 or G4;
iBook; or eMac computer.
- Operating system: Mac OS X version 10.2.8 or later (10.3.3 recommended)
- Memory: 128 MB of RAM.
- Hard disk: 12 MB of available hard disk space.
- Programs: Internet browser required, such as Microsoft® Internet Explorer for Mac or Safari.
- Modem: 28.8 Kbps or higher.
- Internet access: Internet connection through either an Internet service provider (ISP) or a network. Internet access might require a fee to an ISP; local or long-distance telephone charges might also apply.

Umm, Since when was there Windows Messenger 6.0....Must be talking about MSN Messenger 6
And when can we intergration between Office and MSN Messenger 6/7 for Windows....
But too bad we still don't have the pictures and backgrounds for MSN Mac...
it doesn't support display pics, use up tons of ram, god, anything is better than the official client on OSX
how about some display pics and video, MS?
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