Yes. For details, please see our Installation Tutorial. But, briefly:
EVP Office only ever opens connections out-bound, so if your firewall only prevents incoming connections, it will work without any changes.
You can also configure the EVP Office apps to connect via HTTPS, so if your network allows out-bound connections from Web browsers, it should also work automatically.
If you have a restrictive firewall but your network hosts proxies, each of the programs supports multiple proxy types: SOCKS4, SOCKS4, and HTTP Tunneling.
Finally, if you need to modify your network’s firewall rules to make a connection, EVP Office has the option to connect to a static port, so your rule won’t need to change over time.