(There's no video for MSN Messenger 2.5.1 yet. Please contribute to MR and add a video now!)
MSN Messenger was the client for the MSN chat network that almost everybody used between 1999 and 2012, before Microsoft purchased Skype to merge both services together. MSN Messenger 2.5.1 is the last version to support classic (Mac OS 9).
macmsgs.bin (3.41 MiB / 3.58 MB)
/ Binary encoded, use Stuffit Expander
Mac OS 9.2.2 - Mac OS X
Emulating this? It should run fine under: QEMU