At first glance this message looks very very suspicious. Let me count the ways.
1. Software upgrade? Since when do they push them out like that?
2. A subdomain? A rent-a-service-center site, implying they can't even host their own content on their own domain?
3. Bad grammar? Duly noted, although they often abbreviate.
Upon further examination it seems legit, but seriously. They should know better.