Some Mail users are experiencing problems, after upgrading the operating system to Leopard, where Mail will hang, the Mail interface appears blank, or not respond to input. One way to fix is to delete the mail .plist preferences file. This file is located in your Home folder under Library and Preferences. Hopefully you have all of your mail account settings written done just in case you lose them.
Also, if you have Leopard and a second hard drive for Time Machine (you should have a second Time Machine drive if you are on Leopard–that’s the whole point!), run an immediate backup just before you start messing with your Mail preferences just in case. Go up to the Time Machine icon in the right-side of the menu bar and choose “Backup Now.” When it finishes, you may proceed! I don’t want anyone to lose all your emails!
