This is a known issue in MicroStrategy Developer. Exporting from MicroStrategy Web does not display the column, as expected.
SYMPTOM: When the width of a column in report is set to 0, the column still shows if the report is exported to excel from Developer. STEPS TO REPRODUCE:
In Developer, create a report with several attributes and metrics.
Go to grid->option->row and column. Set one column width to be fixed as 0. Then this column doesn't show in Developer.
Export the report to excel. This column shows again.
CAUSE: This is a known issue in Strategy Developer. WORKAROUND: Export the report from Web.