1. Windows® Mail 6.0.6000.16386 (vista_rtm.061101-2205) reports the error as follows: Some of the messages in your Outbox Folder could not be copied to your Sent Items Folder. Your message could not be uploaded to the IMAP server. The server refused to accept it. Subject 'test', Account: 'staffmail.brighton.ac.uk', Server: 'staffmail.brighton.ac.uk', Protocol: IMAP, Server Response: 'There is not enough space on the disk.', Port: 993, Secure(SSL): Yes, Error Number: 0x800CCCD2 In this situation, Windows Mail _loses_ the sent copy of the message. --- 2. Outlook 2007 configured to use IMAP in lieu of MAPI reports the error as follows: Task '… - Sending' reported error (0x800CCCD2) : 'The message cannot be saved to your IMAP e-mail account Sent Items folder, because Outlook is offline or the e-mail server doesn’t allow items to be saved to the Sent Items folder.' In this situation, Outlook falls back to the local Sent Items folder. --- 3. Entourage 2008 falls back to a local folder but fails to show the true placement. At Entourage shows two drafts of a message, both on the server. Outlook Web Access (in the background of the shot) reveals that the earlier draft has not been purged, and the more recent draft is missing from the server. --- 4. Mulberry 4.0.8 warns that there is not enough space on the disk, that it can not append to the Sent mailbox, then confirms that the message has been sent but warns of a post-processing error. The window to the sent message remains on screen. Screen shots at and .