Canmove, confirm
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* Moving messages to a different folder
* Opening file attachments
* Replying to a message / Sending a message
* Displaying a message
* Images not displaying. <small>[http://getsatisfaction.com/mozilla_messaging/topics/what_happened_to_progress_with_new_versions_going_backward#reply_3328214 AV blocks images in HTML emails] and sometimes [http://getsatisfaction.com/mozilla_messaging/topics/what_happened_to_progress_with_new_versions_going_backward#reply_3328214 malware installs bogus Proxies which block or slow internet connections like sending and receiving email, images in email and web browsing]</small>
* Starting Thunderbird
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'''This article is not just about performance issues.''' Antivirus software can also [[Thunderbird:Testing:Antivirus_Related_Performance_Issues#symptoms|cause bad or incorrect behavior, and random or consistent crashes - consistently or randomly]].
<br><br>The information here below is anecdotal, that is users like you giving their personal experiences. We do These are not have an the result of organized battery of testing. So if you have a problem with antivirus software that is not listed here, please help other users by adding your own experience to the list. (create a wiki account, and select edit).
Including but not limited to doing the following:
* Starting Thunderbird* Images not displaying* Opening file attachments * Selecting a different folder* Opening/displaying a message * Moving messages to a different folder * Replying to a message / Sending a message
* Downloading or attempting to get new messages
* Initial mailbox indexing when upgrading to 3.0.1 from a previous version
{{Warning|Your AV software probably worked great for ages , in previous versions of Thunderbird. But that is NO guarantee it will work well now, or in any future version of AV or Thunderbird. AV or Thunderbird updates or versoin version changes can cause interaction problems - even if Thunderbird is the only software affected, and even if your AV version did not change. ''You must explicitly test by disable/enable of AV to determine the impact on Thunderbird.'' The quickest way to test, is to [http://bit.ly/1MU6eMa start Windows in safe mode].'''}}
= First Steps =
== AVAST ==
=== Avast caused slowness Slowness and errors regarding with nsemail.HTML ===
The release of Avast 10.3.2223 ( We think it is that version) has resulted in issues with avasts preventing Thunderbird from functioning correctly. The workaround appears to be to create an exception in avast for the file nsemail.html in your computers temp folder. I have to say "appears to be" as Avast have not yet replied to my email. [https://forum.avast.com/index.php?topic=174203.msg1237332#msg1237332], [https://forum.avast.com/index.php?topic=174392.msg1238419#msg1238419], [https://forum.avast.com/index.php?topic=78428.msg1236530#msg1236530], [https://forum.avast.com/index.php?topic=174153.msg1237802#msg1237802], [https://forum.avast.com/index.php?topic=174153.msg1237802#msg1237802], [https://forum.avast.com/index.php?topic=174140.msg1237521#msg1237521] SUMO links [https://support.mozilla.org/en-US/questions/1068609], [https://support.mozilla.org/en-US/questions/1075713]
=== Avast causes hangs Hangs with "Allow anti-virus clients to quarantine individual incoming messages" ===
As advised by user BigDave67 in th support topic [https://support.mozilla.org/en-US/questions/1094117 1094117]
The initial indexing process, performed upon upgrading from a prior version of Thunderbird, may be sped up by disabling on demand antivirus scanning of the Thunderbird mailbox files.
= Bogus Windows System Proxies Left by Malware (noticed after MalWareBytes scan) =
[http://en.wikipedia.org/wiki/Malware Malware] (usually found only on Windows systems , but could be on any system e.g. Mac or Linux; it's just much rarer for Mac and Windows systems) can install a bogus Internet access proxy.This proxy can slow down Thunderbird and other programs that access the Internet with the symptoms being . Symptoms include "couldn't connect to proxy" errors, slow sending and receiving of email , and images not being displayed in HTML emails. Sometimes these can be found after a [https://www.malwarebytes.com/ MalWareBytes] scan.
== Problem:[http://getsatisfaction.com/mozilla_messaging/topics/what_happened_to_progress_with_new_versions_going_backward#reply_3702668 Windows System Proxy blocking HTML images anecdote] ==
