Question : MS SQL Server vs My SQL...Best options for what I need?

I am currently looking to find hosting for a website that will have a DB backend.  The company owner wanted to go with MS SQL, which was fine with me since I have more experience with it, but it seems for what I need I would have to get a dedicated setup.  I am not experienced enough to manage a web server since that really isn't what I do.

I am curious if My SQL would work okay for what I need?  Think insurance company with online claims and such...I will have to check with the owner to see how many claims and contacts they have in a month, but it appears that right now they are storing about 300-400 MB of data with a CRM company.  They are looking to move everything and control it themselves...

Thoughts...advice?

Answer : MS SQL Server vs My SQL...Best options for what I need?

If you're using .Net, then using MSSQL backend seems to be a pretty logical choice, MS will always support MS best.