If the IS dept can't solve it, use the standard work-around.
1. Save the zip-file to a folder on your hard disk.
2. Extract the report from that folder using either standard XP options for zip-files ("compressed folders") or any free or paid zip-program (like 7Zip or Winzip) that the company uses.
If #2 fails, go back to the IS dept with a new issue, not about Outlook, but about the OS.
Trying to help a coworker out, Dell Laptop, WinXP PRO sp3. He receives large reports in a zip file attachments, in Outlook 2007. Periodically Outlook will quit opening the zip file. The IS dept. told him to clean out some folder were copies of the reports with the same name reside.
I tried cleaning out his Temporary Internet folder, but this did not restore the ability to open the zip file. Is anyone aware of what is happening here?