I was just thinking the same thing yesterday. After trying to use thunderbird 3.0b2, I have found it unusable. I have tried a fresh .thunderbird directory and switching to the i586 version from the x86_64 version. It is still horrible. I do have huge folders with 10k+ messages in them. Thunderbird 3.0b2 seems to scan all folders and download all messages. With the fresh .thunderbird I started with a 32mb .thunderbird folder, but after leaving it over night with just one of my three accounts it was up to 2gb. https://bugzilla.redhat.com/show_bug.cgi?id=493000
Thunderbird 3.0b2 seems to behave after I turn off the sync feature for each account. I think at the very least this feature needs to be turned off by default.
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