Here are a couple of things that may inhibit access to Mailbird at this time:
If you are connected to the internet through a proxy, it may block you from using Mailbird. Until we resolve this, please try a different internet connection that does not use a proxy.
Another possibility is that your computer has a firewall set up that is blocking access to Mailbird. Try changing your firewall settings to enable a connection for accessing Mailbird.
We are continuing to work through these current issues.