Since version v4.0 this is possible. To achieve this, you will need to create a Custom Report.
- Go to Administration > Edit Reports and create a custom report.
- Add a custom section to this report
- Make sure Excel is listed as one of the output formats supported
- In the custom section add the Incidents query.
- Remove the where clause (the one that limits it by project) so that it looks like:
select value R from SpiraTestEntities.R_Incidents as R where R.is_deleted = false
- Save the report.
Now go to the main Reports section and run this report in MS-Excel format.