Beta 1 available here: http://lifehacker.com/364289/internet-explorer-8-beta-1-available-for-download
Beta 2 available here: http://www.microsoft.com/windows/internet-explorer/beta/worldwide-sites.aspx
Coming soon, and supported not by Apple, but by Synchronica Mobile Gateway. Their technology works with Windows Mobile Messaging and should not need any additional connectors on Exchange.
Source: http://www.pcworld.com/article/id,134590-c,iphone/article.html
Link: http://silverlight.net/
Microsoft's Silverlight was released today. Silverlight is a cross-browser plugin that will be going up against Adobe flash. Check out Microsoft's new search engine http://tafiti.com which is built on Silverlight.
More information on Silverlight can be found here: http://silverlight.net/
Microsoft soon to release Moonlight, which will be fully compatible with Linux http://www.mono-project.com/Moonlight