Maybe it was back in 1999 when Google took its Web site out of beta.

Or maybe it was in 2002, when the Mountain View, Calif.-based search giant launched the Google Search Appliance.

Or perhaps it was when Google launched Gmail in 2004.

If it's none of the above, then surely, Google officially threw Microsoft the gauntlet this week when it announced Google Apps for Your Domain.

"We are very serious and committed to the enterprise space," noted Matt Glotzbach, head of enterprise products at Google.

And the world's largest software vendor has noticed this threat.

Full article: internetnews.com