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One possible solution for the attachment issue (and large quantities of text in a notes field) is discussed in this thread:

To summarise - make it work the way that Mail does for attachments and HTML e-mails. Don't download the content (attachment) or all the content (HTML/large quantities of text) from the server until the user chooses to do so. The one limitation would be that this is restricted to WebDAV synch'ers only.