Our office is using Google Apps for Domains for our email. Our customer support guys use IMAP clients (such as Thunderbird and Outlook) to check both their individual email addresses and a "collective" support email address. On the support account, there are several folders for organizing email threads by client. When a user gets a support-related email (either to the support email or their individual email address) they file away the email in one of thse shared folders.

Many of us greatly prefer the Gmail interface (with Folders4Gmail enabled on the Better Gmail 2 add-on for Firefox, for label-to-folder support) over Thunderbird or Outlook. However, there is no way to "share" email threads, complete with labels, between accounts.

The desired end result is that a user logs into their individual account and can see both their account and the support account and can pass emails (labels and all) between the two accounts - or at least from their individual account into the support account.

Any ideas?