Well, to be more specific, Mail.app did. It keeps showing the beachball. I tried a search on the internet, did some things, and finally installed Thunderbird and Firefox.
MUCH happier, I like the calander integration, and installed some firefox plug ins (noscript, stuff like that).
Maybe I’ll go back to Mail.app after next update but at least I can happily work now.
Dan's Tips 
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