You can forward any email from Karbon.
To do this click on the options menu within the email and select Forward. Like forwarding email from your email client it will forward the entire email history.
If you forward an email, it will automatically be split into a new conversation.
When you do this, an activity event inside the email conversation will let you know this has occurred. You will be able to click the link from this activity, which will open the new email conversation in a new browser tab.
Karbon Tip: instead of forwarding an email to your colleague, have you tried adding a comment?