Google clearly thinks Google Apps is a better enterprise service than Microsoft Office 365, which Microsoft plans to launch on Tuesday.

A post by Google Apps Product Manager Shan Sinha did not mince words and took hard-hitting shots at Office 365.  The following are highlights from the post:

- Office 365 is for individuals. Apps is for teams.

- You don't need to buy additional licenses to work with others, or hope people outside your company have upgraded to the same software.

- Office 365 is built for Microsoft. Apps is built for choice.

- Office 365 is optimized for Windows-based PCs and devices, which reduces your flexibility.

- Office 365 is 11 different plans, three editions and two tiers. Apps is $5/month with no commitment.

- Google Apps are accessed in a browser. There's no client software to install, secure and maintain.

- You can't just take legacy, desktop software, move some of it to a data center and call it 'cloud.'

In an unusually dedicated marketing effort (for Google), the company has also gathered many video and text testimonies for Google Apps from its satisfied customers .  Some of the major praises of Google Apps include cost savings, flexibility, efficiency gains, and little to none maintenance requirements.

Google wants the multi-billion dollar enterprise market badly. 

A recent poll of 2,000 US businesses by White Stratus found that almost 1 in 5 businesses with more than 250 employees already use Google Apps rather than Microsoft software.

Google fought hard for this space.  Now, it certainly doesn't want that progress to be derailed by Office 365, Microsoft's direct counter to the cloud-based Google Apps.