The tab "Address/Contacts" lists all created addresses of your client. If you right click on the entry a dialog will open.
Here you can:
|•||Easily duplicate the contact|
|•||Call the client if you've purchased the cti module|
|•||Send an email to your client|
|•||Open the website of your client|
|•||or copy the address to the clipboard to use it in another program.|
The "Main contact" is used for the presetting of the email forms in Xpert-Timer. So if you send a report through email, the main contact will be pulled from the client info, unless you've entered a specific other contact person in your project settings.