Actually, it is compatible (only with GPL v3, not v2), but : "The Apache Software Foundation does not allow its own projects to distribute software under licenses more restrictive than the Apache License, and the Free Software Foundation does not distribute software under the Apache License." (copied from http://www.apache.org/licenses/GPL-compatibility.html)
Then the official distribution of POI MUST not be in GPL, even if compatibility is possible. Besides, the only part in GPL (except what come from POI CVS) is a little class used in the "hdgf" section that could be easily rewriten, or, the "hdgf" part may be packaged separetadly, to be in GPL without the rest of POI. Benoît
