Mail Upgrade message in Mavericks won't go away

Have upgraded from 10.8 to 10.9 Mavericks on my Macbook Pro, everything pretty much went fine, except for a problem with Mail.

Everytime I open it, I get the below screenshot, saying "Welcome to Mail. To use the new features in Mail, your Mail messages need to be downloaded to this computer...."

Welcome to Mail Mavericks Issue Upgrading.png

If I click continue, I get a "bing" sound and then my Mail opens up, but I get the same message each time I open Mail.

Annoying.

Has invited:

howapple - hello

Favor from:

I managed to stop the message more simply, by:

1. Open Mail

2. In Prefs>Accounts>Account information uncheck the "Enable this account" on all accounts

3. Quit Mail

4. Reopen Mail (no message appears)

5. Re-enable account in Prefs>Accounts>Account Information

6. Quit Mail

7. Re-open mail

Everything works ok and no message appears.

Hope it works for you too.

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