The head of Microsoft's Platforms and Services Business (which includes the online business), Kevin Johnson, is headed to Juniper Networks.
Microsoft is also splitting its online business in half:
* Windows Live (Internet Explorer, Hotmail, Microsoft Messenger, Spaces) will now live within the Windows division.
* The ad and media assets (aQuantive, ad-serving, search, MSN) will stay in a separate online services division.
A source close to Microsoft says the changes were driven by two factors
Check out the Huffington Post's Microsoft big news page for a snapshot of the company's news earlier this month and year.