Mail stops importing mailboxes after Time Machine restore

Hello,

I replaced the hard drive in my MacBook Pro by a solid state drive (Crucial M4 512Gb) hard drive.

Before installing it, I let Time Machine backup my complete hard drive to an external USB hard drive (backup done over night).

I installed the SSD, booted the MacBook in recovery mode (CMD R), initialised the SSD using Disk Utility and restored the complete hard drive from the Time Machine Backup.

Everything fine except for Mac Mail.

If I start Mac Mail: it wants to import my mailboxes.

However, it stops at:

Importing mailbox

Imported 1112 of 1124 messages

Time remaining: Less than a minute

Then the fan comes up (high CPU load) and nothing happens.

If I cancel, the fan speed drops and Mail quits.

If I start Mail again, it reports one message less to import, thus:

Importing mailbox

Imported 1111 of 1123 messages

Time remaining: Less than a minute

I can repeat this (everytime the number of mail messages drops by one).

Problem is that I can't start using Mail until the messages are completely imported.

Anyone a tip what's going wrong and how to solve it?

As extra info: I made the Time Machine backups with nothing started on my MacBook (only Finder running).

Kind regards,

emeu1