OS : Windows vs OS X, Linux, Solaris, and now Google Chrome OS
Email : Hotmail/Live vs GMail, YMail
Search : Bing vs Google,Yahoo..
Database : MS Sql Server vs Oracle,MySQL,PostgreSql..
IM : MSN Messenger vs GTalk, Yahoo Messenger,IRC,Pidgin
Programming platform : .NET vs Java..
Languages : C#,VB.NET,ASP.NET vs Java, Ruby,Python,PHP,Perl..
Mobile OS : Windows Mobile vs Android, OS X, Symbian..
Media player : Zune vs iPod, Creative, Sony..
Office Suite : Microsoft Office vs OpenOffice, Google Apps
Browser : Internet Explorer vs Firefox, Safari, Chrome, Opera
Gaming Platform : XBox vs Nintendo, Sony and now iPhone
Vector graphics for web : Silverlight vs Flash, Flex
My head is spinning. If you notice the ones on the right of VS - for instance Opera - that is their entire life - the reason for their existence. They are focusing all their energies and souls into their products -yet Microsoft is able to match them and give a good fight.
Even though I am a MS baiter, I have to admit - Microsoft is good.
The above list is not complete. What other battles you think Microsoft is fighting?