In our company we are using Mdaemon mail server and Microsoft Outlook 2000, 2003 or 2007 with Outlook Connector (on some computers). We connected some users to our Mdaemon server (version 10.0.1) through Outlook Connector (MDaemon plugin for Outlook, version 2.2.1) and then users get the message: 'The operation cannot be performed because the object has been deleted'. That happens when user tries to send file through MS Word, Excel or 'Send To' command by right clicking on file, then Send To > Mail recipient. The message appears not every time. Users without Outlook Connector do not have such a problems. It looks that there are no problems with Outlook 2007 although we have too few of them to be sure.
Users are using Outlook 2000 and Outlook 2003 with the latest updates and IMAP protocol.