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What is the difference between version 38.7.2 and bersion 45.0?

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I have Thunderbird 38.7.2 already installed on my PC. I understand that Thunderbird 45.0 has just been released. What is the difference and the pros and cons of each version. To upgrade to version 45.0, do I simply download afresh and install whilst version 3872 is already on my PC?

I have Thunderbird 38.7.2 already installed on my PC. I understand that Thunderbird 45.0 has just been released. What is the difference and the pros and cons of each version. To upgrade to version 45.0, do I simply download afresh and install whilst version 3872 is already on my PC?

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see https://support.mozilla.org/kb/new-thunderbird-45 https://www.mozilla.org/thunderbird/45.0/releasenotes/ http://mzl.la/1ScgcZK (the fixed bug list)

Also http://getthunderbird.com/ as links to "what's new"

Please file reports for any NEW bugs for 45 by setting version number and adding the keyword "regression" to the bug report. https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird

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updates will be available in a few hours to a few days