Well this says enough (taken from their Terms of Service) :
9. Warranty Disclaimer. YOU ACKNOWLEDGE THAT THE SERVICES AND THE SOFTWARE ARE PROVIDED "AS IS, AS AVAILABLE" WITHOUT ANY WARRANTY OF ANY KIND. UNITED ONLINE WEB SERVICES HEREBY DISCLAIMS ANY WARRANTY OR CONDITION WITH RESPECT TO THE QUALITY, PERFORMANCE OR FUNCTIONALITY OF THE SERVICES AND SOFTWARE, OR WITH RESPECT TO THE QUALITY OR ACCURACY OF ANY INFORMATION OBTAINED FROM OR AVAILABLE THROUGH USE OF THE SERVICES AND SOFTWARE, OR THAT THE SERVICES AND SOFTWARE WILL BE UNINTERRUPTED, ERROR-FREE OR FREE OF VIRUSES OR OTHER HARMFUL COMPONENTS. THE SERVICES AND SOFTWARE MAY CONTAIN ERRORS. NO ADVICE OR INFORMATION GIVEN BY UNITED ONLINE WEB SERVICES OR UNITED ONLINE WEB SERVICE’S REPRESENTATIVES INCLUDING, WITHOUT LIMITATION, CUSTOMER SUPPORT REPRESENTATIVES, SHALL CREATE A WARRANTY. UNITED ONLINE WEB SERVICES DISCLAIMS ALL WARRANTIES ..... (goes on)
And there's more (not related to your sites), like :
United Online Web Services may from time to time download and install software, including additional Software or third party software, to your computer while it is connected to the Internet through any means. United Online Web Services retains the right to limit, restrict or require the use of certain software or service in connection with the Services.
erm... no comment