moving message on nearly full mailbox with IMAP

[Christian Anton]

Hi everybody again,

As Ken helped me with my feature request for the quota behavior of cyrus-imapd 
i now have one more question i don't understand.

If i have a Mailbox with 5MB quota, there is 4.9MB in use and i want to move 
one message with 1 MB from one folder to another, cyrus gives me an error 
message that says i'm "over quota".
Why does moving a message need space in the mailbox, i don't want to copy it 
but to move. 

Tried so with squirrelmail and the webmail-Interface of openxchange.


Thank you all in advance


Christian
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