IBM to contribute Symphony to OpenOffice.org

That page refers to the binary. And you're correct, the binary is LGPL3 (in fact, given the licencing murkiness now Oracle has donated OOo to Apache, maybe it isn't. Anyways, that WAS true before Oracle changed the licence).

As for MPL, look here ...

http://www.documentfoundation.org/develop/
http://wiki.documentfoundation.org/License_Policy

Let's split the LO code base in two - the code that came from OOo, and the code that's been added whether Go-OO or LO.

The OOo code has been relicenced Apache.
The Go-OO/LO code is available under the MPL.

So, it's a fair claim that you can copy all of LO without going near the (L)GPL. To be safe, yes you probably would want to make sure that all the Oracle code had been relicenced as AL2.

Cheers,
Wol