I had a customer the other day that was complaining about an error message that was coming up with her Microsoft Outlook. We had just added her AOL account to Outlook using IMAP, and she was getting the following error message:
Your IMAP server wants to alert you the following: Can’t read attachment for message [messagenumber]
I did a search on this message and couldn’t find much, but did find a few other similar messages. As it turns out, looks like some of her emails or attachments were corrupted on AOL’s servers, and when Outlook was syncing them it notified her. The reason she never noticed it before was because when you browse your mail on AOL, it only downloads the email that you click on, not the entire message (obviously).
Luckily, out of her thousands of emails, only 17 returned the error.