Changes

{{Warning|Your antivirus software probably worked great for agesmonths or years, across many previous versions of Thunderbird. But that this is NO guarantee it is working correctly now. Antivirus and Thunderbird have a complex relationship which , and that relationship can be broken by updates or version changes (of <u>either </u> software) - yes . Yes even if Thunderbird is the only software affected, and even if your AV version did not change. AV vendors don't always play nice, and don'You must explicitly test by disable/enable t always adapt their software to new versions of AV to determine other software on your computer, whether you know it or not they do make accommodations under the impact on Thunderbirdhood for how they interact with other software.'' The quickest way to testIn short, if TB performance is to [http://bit.ly/1MU6eMa start Windows good when AV software has been disabled, doesn't make this fundamentally a bug in safe mode]Thunderbird, or [https://supportalthough there are certainly areas of Thunderbird performance that can be improved.apple.com/en-us/HT201262 start Mac in safe mode].'''}}

'''*NOTE, disabling antivirus using AV settings has proven over the years to not be a perfect or sufficient test. Sometimes AV setting changes workdo what they should, but often it does not and so . Therefore the only test that can be fully trusted is OS safe mode.'''