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*[[Thunderbird:Testing:Memory Usage Problems|Diagnosing Memory Usage Problems &amp; Performance]]<br> *[http://kb.mozillazine.org/Thunderbird_:_FAQs_:_Anti-virus_Software Does excluding Thunderbird profile directory from scans put my system at risk?]

Typically, mild to severe performance problems. <p><br>'''WARNING: If your Your AV software worked working for a previous version of Thunderbird ... that doesn't mean it works properly <u>now</u> with the a newer versionThunderbird. And, if Thunderbird is the only software affected ... it doesn't mean the problem can't be caused by antivirus. You must explicitly test by disable/enable of AV to determine the effect on Thunderbird.'''