Excel COM object not being destroyed

[joanne]

Hi everyone,

I have a .NET component (DLL) that uses Excel (creates
workbook, adds some data, saves workbook, quits Excel)

If I call this component from a .NET console application
it works fine.

If I call the same component from a WebService I find
that EXCEL.EXE hangs around (using TaskManager).

Any ideas what causes this?