FC3 thunderbird can't delete,move or copy mail-messages

[Resource Fedora <resource_fedora@xxxxxxxxxxx>]

Since a few days, thunderbird can't delete messages in the folders.
Junk messages stay in the inbox folder instead of the junk folder.
Also move or copy the messages to an other folder don't work.
When I want to save new mail-messages, the application can't copy the 
message in the draft folder.

I have no errors and I can read the messages.

I have used 'thunderbird-1.0.6-1.1.fc3.rpm' to update my mail 
application. My Fedora version is FC3.

Thanks for your advice or help,

--
Kristoffel