http://blogs.technet.com/brettjo/archive/2008/08/07/communicator-and-ocs-tech-tip-4-updating-your-outlook-contacts.aspx**Be warned this will reset everything to +44 even if you have non-UK \ international numbers** You’ll need a coffee for this one, but is probably the most useful. You can only dial external numbers from Communicator when a number is in E.164 format,en-GBCommunityServer 2.1 SP1 (Build: 61025.2)