The email has NOT come from O2 so they have no knowledge of it and their systems have not been compromised. A virus scammer has just created an email spoofing the O2 email address which isn't something that they can stop.
|O2 Business Contracts Lease Spam Virus Email - Your Device is on its way|
Email details as below:
O2 Lease <O2BusinessContracts@o2.com>
Your device is on its way
O2 Customer Service