We have an older app built using MSXML2 DOM to manage XML data feeds and it has stopped working. We are getting HTTP request errors 0 (Message OLE IDispatch exception code 0 from msxml4.dll: System error: -2146697208).

Two questions:
1) Can anyone tell me what this error means? I am having a hard time finding out where to get info on this error.
2) If we convert the program to use MSXML4 are there any gotchas to be aware of?

TIA for any help you can provide!
Margaret