Just saw this pop up at MSNBC.

According to the story, Yahoo and Microsoft have started to test making their Instant Messaging (IM) systems work together. While not technically challenging, the millions of users for both companies’ system means that the scale of the system is daunting.

The companies first announced this plan last October. Now they’re starting implementation. Google is not the obvious target here, ( a rarity when MSFT and Yahoo! work together ): AOL is.

Sure wish they could get Skype into the mix.