IMAP4 - Not able to fetch calendar/tasks/contacts mailboxes messages using IMAP4 from exchange server.

[unnatRevo]

I am able to fetch all mails from Inbox and their subfolders and Sent mails as well. But when I try to fetch messages from contact/calendar/tasks mailboxes folder it is somehow not working. It displays me below messages.

"The server couldn't retrieve the following message:"

Is there any workaround for it? I am aware that the IMAP4 protocol does not allow me to read these mail messages, but I need to make it if feasible.