I'm not sure either, but here's some data:

Employees: 350 (Source: Forbes, Dec 15th, 2010) Avg salary, lets assume 80K. (probably too low) TCO per employee $110K

$110K * 350 = $38.5 Million per year on employees.

They've been paying NTT for managed hosting thus far - so much that NTT has cited it as a reason they're expanding their hosting network. They're about to open their own data center in Sacramento - probably because they're realizing how expensive NTT is. My guess is they could be spending as much as $30 million per year on hosting and infrastructure.

Add another $10 for office, admin and legal and you've got a burn rate of just under $80 million per year or $400 million over 5 years.