Quickoffice have released their own statement today noting that its Symbian business represents only a portion of its overall business and that it will ship on 200 million Nokia Symbian phones before Microsoft's product is even released.
I honestly don't get the Nokia/Microsoft thing at all... With Symbian supposedly going open-source it makes zero sense for them to have a proprietary software company as a partner.
Plus, neither of these two behemoths are particularly known for being "nimble"...