Outlook 2003 Works Intermittently On Windows 7

I have a new HP Notebook with Windows 7. Downloaded my old Office 2003. However, Outlook only works intermittently without any rhyme or reason. I've kept a log since August 5 for being on and being off. It is mostly off. The # of the error message that comes up is (0x800CCC0F0), it says: "The connection of the server was interrupted. If this problem continues, contact our server administrator or Internet service provider." My internet provider is AT&T u-verse, they tell me that they do not deal with Outlook problems, I should use webmail. Of course I use it to get my emails but don't anybody tell me what to use, I have used Outlook for the past 15+ years and I intend to continue using it. I use the very unimaginative webmail out of necessity. AT&T also tells me that that I can subscribe with a one year contact $ 15 a month to their special service to address my type of problem.