I have a Windows 7 64 bit computer with Windows Live Mail which connects to Gmail (both set up as IMAP).  The Inbox, Receipts, Spam, Trash and Sent folders are always synchronized.  However, I have lots of personal folders I created within WLM which are not sync'd and don't even exist in the web-based Gmail account.  I recently set up my wife's computer which came with Windows 8.1, and to my surprise her personal folders created within WLM "do" show up in her web-based Gmail account and appear to be automatically sync'd to it.  She is also set up with IMAP.

Does anyone know whether there is a way to sync all folders in WLM to GMAIL using Windows 7 or is this one of those benefits of upgrading to 8.1.

Thanks.