Endless "Preparing to import messages" in Yosemite Mail

Hi
Upgraded to Yosemite. Everything went fine the first 2 days.
Yesterday when I launched Mail, it wanted to reimport all the messages.
As this process was going for hours, I read the support where it was suggested that I first delete the Envelope Index files and the Preferences so they get rebuilt.
I did that and yesterday, before going to sleep, launched Mail again
This morning the same message was displayed and when I look within the Main folder there are no new Envelope Index files nor new Preferences.
The Mail folder is 27 Gb but I had no problems before in doing the same process when I was upgrading from previous versions to newer versions of Mac OS X.
Any idea? Thank you.

Hi
Upgraded to Yosemite. Everything went fine the first 2 days.
Yesterday when I launched Mail, it wanted to reimport all the messages.
As this process was going for hours, I read the support where it was suggested that I first delete the Envelope Index files and the Preferences so they get rebuilt.
I did that and yesterday, before going to sleep, launched Mail again
This morning the same message was displayed and when I look within the Main folder there are no new Envelope Index files nor new Preferences.
The Mail folder is 27 Gb but I had no problems before in doing the same process when I was upgrading from previous versions to newer versions of Mac OS X.
Any idea? Thank you.

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