Re: Security? Licenses?
It all boils down to trust. The biggest issue of trust for a company is the level of trust it puts in its employees. Far and away the greatest cause of data security breaches is accidental or deliberate action by an employee.
One example is the use of unencrypted emails as the file sharing mechanism of choice both within a company and with the company's customers, suppliers and partners. It doesn't really matter where your email service is or how tightly its security is locked down. Sensitve data is routinely launched in the clear, into the wild.
Now add BYOD smartphones and tablets and things get even more interesting.
A company with substantial in house systems puts a particularly high level trust in its IT administrators, who can, and regularly do, make mistakes, or worse, deliberately sabbotage systems or discolse sensitive data. Hell hath no fury like a sysadmin sacked.
Where a company's systems physically reside, other than the obvious data protection constraints on geophraphic location, is in many ways the least of its data security worries. In this respect, the use of an enterprise class cloud service is at least as good as using your own data centre.