Many users are complaining about Mail 2.0 freezing when launched. It occurs when Mail 2.0 automatically starts retrieving mails from your POP accounts.
Here's a simple workaround:
- Disconnect your Mac from the network (via a "No Network" prepared network location configuration for more convenience)
- Launch Mail2.0 and wait for it to indicate mailboxes are unreachable (disconnected) - Mail 2.0 will not be hanging
- Connect your Mac to the network (via your normal network location)
- Click the Retrieve Mail button.

