The memory problem is a very well known issue, and with 8GB memory, I think your safe, but definetly keep the Opera cache clear...that is a biggie along with the VZApps (I can't believe they even keep that on the new Omnias being sold)!!!!
I had this issue at first, but after a hard-reset and installing everything again, and placing files on my memory again, the issue went away and I haven't seen it since. So eventhough I don't care for the way the rep worded it, they are most likely pretty accurate.
The texting issue is new to me. Are you sure the data connection is good? Is there a third-party app (Vito, PocketCM....) being used?
I don't use Hotmail, but I think this site may help:
http://home.mobile.live.com/home.mvc...roduction/Mail