recreating task folder

[Polp]

Hallo
one of our user has problem with task folder - she cannot add new task
with error message "parameter is incorrect". I have tested it from several
clients and in all the same error - so the problem is with her mailbox.

I created new task folder, but I am not able to delete the old Task
fodler. Is there any possibility how to do it and afterthen how to set
default task folder to newly created one?

thanks