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I think that setting properly your POP account will be enough.<BR>
Your contacts are easily exportable. Just save them as a VCARD addressbook (or separate VCARD files) and import them in the new app.<BR>
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I can't encourage you to make the change. Time ago I try Claws Mail but I didn't like and never try it again.<BR>
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Exactly, why do you want to change? What is wrong or what is the lack you find in Thunderbird?<BR>
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You can also try: Seamonkey (Mozilla), Evolution (with calendar and other things), Kmail (a little tricky but with good features).<BR>
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<I>Regards,</I><BR>
<B><I>Lailah</I></B><BR>
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