Has anyone experienced their email crashing ... you go to open it up and it crashes? Then a page comes up saying mail quit unexpectedly

Give the following a try:

1. Temporarily disconnect your Mac from the network. (Note: We don't want the Mail app to try to download messages for each of your accounts at this point.)
2. Launch the Mail app, and then, go to Mail > Preferences > Accounts > Account Information.
3. For each of your email accounts, disable the Enable this account option.
4. Close the Accounts pane, and then, close the Mail app.
5. Relaunch the Mail app, and then, reconnect your Mac to the network.
6. Return to Mail > Preferences > Accounts > Account Information, and then, re-enable one of your email accounts. Allow it to download any messages. It should be completed doing so when you see the Checking for Mail... disappear in the lower-left corner of the Mail app's window.
7. If successful, re-enable the next account and continue doing so one-at-a-time when successful.