In the contact view you will find the "Emails" tab on the right-hand side (if you have added the tab to your contact view. You can find out how to do this here). By clicking on the Email tab you will see all your global email accounts. (Creating global email accounts is explained on the page Global email accounts explained). Now you can select one of your existing accounts by clicking on it.
Then click on the folder you want as default folder want to set.
You will now see the last ones per page 15 emails of the desired folder is displayed. After setting up your email folder, you can view your emails. To do this, simply click on the underlined subject your email.
Global e-mail accounts can be used not only with contacts but also with projects be linked.
To do this, simply open the project that you want to link to a global email account and click on the Emails tab. The settings here are the same as described above.