Vista - Outlook 2003 problem sending & receiving e-mail

My Dell laptop came with Vista Home Premium 32bit factory installed. I use Comcast.net as my e-mail server. I originally tried to install Office 2002 and had trouble with Outlook (as is well documented in these forums). I recently upgraded to Office 2003 and have finally got Outlook working without crashing. However, receiving e-mails from Comcast is on a several hour delay from when the message first arrives on Comcast.net to when it appears in Outlook. Sending messages however is stalled altogether. My Pop3 and SMTP servers are set up correctly according to Comcast but sent messages remain in my outbox indefinitely and I receive the following error:

Task 'mail.comcast.net - Sending' reported error (0x80048002) : 'This task was cancelled before it was completed.'
Task 'mail.comcast.net - Receiving' reported error (0x80048002) : 'This task was cancelled before it was completed.'
Task 'mail.comcast.net - Sending' reported error (0x80048002) : 'This task was cancelled before it was completed.'

Any thoughts???

Hi, srandk, and welcome to the forums.

My sister is*constantly* having issues sending mail from Outlook, whether it is through her Comcast account or through her work email server. I have a feeling they are blocking something and not telling a lot of people.

We have tried brand new computers with brand new installs of both 2003 and 2007, with no luck.

Thanks Johngalt,

Do you think it's a Vista problem or an Outlook problem?