If you would like to export a contact list within your account to an Excel compatible file, you can do so via the 'Contacts' page in your account. From the 'Contacts' page, using the drop down boxes on the left side, locate the list you wish to download, and then click the 'Download' icon from the top right corner of your contacts table. (it looks like a box with a down arrow in it!)
If you would like to bulk export all contact lists within your account, you can do so via the 'download data' area of your account. For more information on this area, please see our 'Download Account Data' article.