Hosting a SaaS PHP/MySQL web application

Hi
I am building a PHP web application ( to be used by about 5 customers ) with MySQL database using partitionning strategy for scalabilty purpose.

Customers list can grow up to 100, so I pre allocated 100 partitions for the MySQL database.

Can I host my web app on Window Azure?
If yes, what pricing plan should I choose to start my business? (I mean Server requirement : Memory, number of core, espace disk)

Is MySQL partitionning a good strategy for such app?

Thank

Have a nice day