Some ,mail messages won't load after migrating to Lion

Question

I've migrated Mail from Snow Leopard to Lion on a new computer but from time to time some messages won't load. It's a real pain because I only dicover it when I go to read a message I want to read. Anyone have any ideas?

Answer 1

Mail, the application, should not cannot contain any message data assets. The Mail application must sit in the Applications folder, and be usable to every User Account on the Mac, and not just yours (understand you might be the only user, but making a point).
Mail, the folder of data for just your emails, should properly be at Home/Library/Mail.
Let me ask again -- in the Applications folder is there an Icon for Mail, and is it the Icon of a postage stamp, or is it perhaps the Icon of a folder?
However, let me note, that now that I have booted back into Snow Leopard, and used Get Info on the Mail Icon in the Applications folder, it is reported to be 77.5 MB! Looking at it from other boot volume (Leopard) does not see all the elements of its "package" apparently. My apologies.
Now it is time for a different test -- Create a New User Account, and as that New User launch Mail and try setting up one new email account - if POP select to leave messages on the server. See the following if not familiar with adding a new user account:
http://docs.info.apple.com/article.html?path=Mac/10.5/en/8235.html
The reason for doing this is to test the Mail app itself, and not to permanently switch to a new user account. Tell me if the behavior continues in that New User Account with Mail?
Ernie