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Mail upgrade fails on import

Update:11-30Source: network consolidation
When upgrading to Yosemite, the Mail app has gone into an endless loop of importing.
It tries to import, then reports that it has failed.
You then get a message about the Mail Index has been damaged and so you have to quit Mail.
It then starts the process all over again.
I have around 31K messages.  But Mail is COMPLETELY unusable.  Cant open/view/read/send/search/play with emails.
Very disappointing...
Here are some interesting entries from the system log:
20/10/2014 10:49:34.239 Mail[3459]: resolvedBaseMailDirectory /Users/amorton/Library/Mail
20/10/2014 10:49:48.805 Mail[3459]: Capturing diagnostics to trace took 14.565747
20/10/2014 10:51:07.133 Mail[3459]: open on /Users/amorton/Library/Mail/V2-Temp.noindex/[email protected]/Personal.mbox/Info.plist: No such file or directory
20/10/2014 10:51:22.518 Mail[3459]: Exception during migration: data parameter is nil
20/10/2014 10:51:22.518 Mail[3459]: Migration (simple) failed and took 108.279527 seconds
20/10/2014 10:51:27.228 Mail[3459]: emlxCountPreMigration 61078
20/10/2014 10:51:27.228 Mail[3459]: emlxCountPostMigration 61078
20/10/2014 10:51:27.229 Mail[3459]: lostAndFoundEmlxCount 0
20/10/2014 10:51:27.229 Mail[3459]: messageCountPreMigration 31712
20/10/2014 10:51:27.229 Mail[3459]: messageCountPostMigration 31712
20/10/2014 10:51:27.230 Mail[3459]: MessageTracing took 4.710642
20/10/2014 10:51:27.230 Mail[3459]: Upgrade failed because of exception: data parameter is nil
20/10/2014 10:51:27.231 Mail[3459]: Library upgrader failed: Error Domain=MCMailErrorDomain Code=1029 "data parameter is nil" UserInfo=0x7fac01622a90 {NSLocalizedDescription=data parameter is nil}
The thing is - that file does exist (the Info.plist reported at 10:51)
Any ideas, or are we destined to wait for the upgrade patch!?

The Best Answer

For what it's worth, I solved my problem.  I went into the preferences for iCloud and unchecked mail and then rechecked it.  Mail then started up just fine.  However, my old messages for a couple pop accounts were not there (icloud and google mail were fine).  So then I tried to import, but in the dialogue box, it didn't show the mail folder or even the library folder (which is normally hidden).  So in finder, using the option + go menu I navigated to the libary folder and made an alias for the missing pop account's mail and put that on the desktop.  Then I went back to mail and selected the alias for the missing pop account mail.  It had no problem importing then, although it did take a while.  Then when I selected import again, for some reason it went right to the correct mail folder within the library folder and I didn't have to make an alias for the other account.  The mail all came in then under the imported category.  For me that's actually ok.  I had one piece of mail I really needed to find, and the search found it right away.  So at least for now, all is well.
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