At some point in 2007 Cheywas assimilated by the Borg (around Halloween I think). However, in true Chey fashion it wasn’t enough to return to Siamese form, she had to take the Borg with her.
I expect that it was the upgrade to Vista that did it.
Some things even the Borg can’t do anything about.
This weeks Meezer Rule:
If the Borg try to assimilate you, Assimilate them instead.