Mail refuses to launch. Gives the console message: MailAccounts were initialized before migration from V1 to V2!

Question

Tax day, so I upgraded to Yosemite.
When I launch mail, the mail "updater" program comes up and says that it's initializing then the UI goes away.  The mail UI program never starts.
Here are the messages from the console when it starts:
4/15/15 6:08:53.072 PM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
4/15/15 6:08:53.514 PM Mail[882]: Using V1 Layout
4/15/15 6:08:53.752 PM Mail[882]: Upgrading Library from 4.192 to 4.192
4/15/15 6:08:59.153 PM Mail[882]: MailAccounts were initialized before migration from V1 to V2!
4/15/15 6:08:59.168 PM Mail[882]: MailAccounts were initialized before the Library was ready!
It seems that if the upgrade is not needed, then it shouldn't fail.  Any ideas as to what to do next?

Answer 1

Hi M3T00,
I faced exactly the same problem. Here is what I did to handle this
open your Terminal.app
go to your Library folder
cd Library/
rename your Mail folder into some kind of backup
mv Mail _Mail
start your Mail.app which should start by now
configure your email accounts (guess they can be imported somehow, but I was faster simply reconfiguring them)
"Import Mailboxes" from your backup folder "Library/_Mail" as described in Mail (Yosemite): Import or export mailboxes
If you can't access Library/_Mail from Mail copy it from your Terminal to any accessible location eg
cp -RP _Mail/ /Users/<your_username>/Downloads/
if the import went well you might delete your Mail backup folder via Terminal
rm -fdr _Mail
Not a perfect solution since it includes some manuell actions and sorting but at least an option.
Cheers