Odd, from 1.0.2. to 1.0.5? This should be interesting. Thanks for the tip once again, I'll grab it right away.

yeah because bugs in one app are in some cases linked to the other

Easy as using the Import utility built into Thunderbird. It will import your mail, address book and settings from OE. And the built in Spell checker and junk filter in Thunderbird is tight.

Well, the import is easy. As for whether it's worth switching, I guess that really depends on whether you'd prefer to use a much better designed email client that's actually been updated in the last 5 years and doesn't take the liberty of loading your machine with viruses for you?