There's no GUI to list/export all email addresses. Here's a script to do that - ListEmailAddresses.vbs.
File: ListEmailAddresses.zip
What does it exactly do?
- Queries Active Directory for Contacts & Groups
- Lists their email addresses
- Queries Users
- Lists enabled users' email addresses
- Lists disabled users' email addresses separately
- Outputs to command line and also to a text file - c:\proxyaddresses.txt
- X.400 addresses are ignored