Sobig.F became one of the most widespread viruses ever , crippling corporate e-mail networks and filling home users ' inboxes with a glut of messages .

Since surfacing late Monday , Sobig.F has been crippling corporate e-mail networks and filling home users ' inboxes with a glut of messages .

Please tell me if the sentences above mean the same.
Possible answers: A. no B. yes
B.