If you have two computers that are never found in the same local network, you can synchronize those computers over the Internet although CodeTwo Outlook Sync is mainly local network software. There are several prerequisites to using CodeTwo Outlook Sync over the Internet. If you discover that you cannot use the program over the Internet, you will still be able to use it in the office/home. The changes you make when outside will synchronize the moment the connection can be made in the local network.

1. While choosing the remote machine during the initial synchronization, you need to use the IP address field and provide the public IP address of the remote machine. More about choosing remote machine...
2. You will have to have a public IP on both machines. If they don't, the computers will not be able to find each other in the Internet. If you are not sure to have one, consult your ISP.
3. Your public IP should preferably be static (does not change periodically). This is to ensure the computers can find each other after the initial use. If it is not static, consider registering your IP with a DNS service.
4. You can check your public IP by typing 'what is my ip' in Google Search and choose one of the suggested websites.

Fig.1. You can use your browser to check what is your public IP address.

5. If you are using a router or a firewall, you need to allow incoming connections that will be established on the port used by Outlook Sync (default :5998) and route these connections to the correct machine inside your network.
6. If the connection is not possible, consult your ISP to learn if incoming connections such as these are enabled for your account. Some ISPs may block this type of Internet traffic or will suggest a different port to use.
7. VPN software is an alternative to using the public IP with Outlook Sync. Consult your local IT specialist if you decide to buy VPN software.