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'''This article is not just about performance issues.''' Antivirus software can also [[Thunderbird:Testing:Antivirus_Related_Performance_Issues#symptoms|cause odd behavior (bad , incorrect or incorrect behaviorunusual), and crashes (random or consistent crashes, infrequent or frequent)]].
<br><br>The information below is anecdotal, from users like you giving their personal experiences. These are not the result of organized testing. So if <br><br>If you have a problem that is not listed here, please help other users by adding your experience to the list. (create a wiki account, and select editto change the wiki)
* OS hangs or crashes
* 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 (receiving mail)
* Initial mailbox indexing when upgrading to 3.0.1 from a previous version
= My Problem Cannot be Caused by Antivirus =My Antivirus software has been working great. Thunderbird is the only program that is affected. I even tried disabling my antivirus software. {{Warning|Your AV antivirus software probably worked great for ages, in across many previous versions of Thunderbird. But that is NO guarantee it will work well is working correctly now, or in any future version of AV or Thunderbird. AV or Antivirus and Thunderbird have a complex relationship which can be broken by updates or version changes can cause interaction problems (of either software) - yes 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], or [https://support.apple.com/en-us/HT201262 start Mac in safe mode].'''}}
= First Steps =
'''The quickest way to test in impact of antivirus and other software on Thunderbird is to [http://bit.ly/1MU6eMa start Windows in safe mode], or [https://support.apple.com/en-us/HT201262 start Mac in safe mode].''' If problem is gone in safe mode, then the cause is often antivirus software. '''*NOTE, disabling antivirus through AV settings has proven over the years to not be a perfect or sufficient test. Sometimes it works, but the only test that can be fully trusted is OS safe mode.''' '''*NOTE, if you altered the default profile location, or location of Thunderbird accounts, to store mail somewhere on a non-standard location, you MUST change your antivirus software to exclude these nonstandard locations.''' = Testing Suggests My Problem is Caused by Antivirus Software =If safe mode or other adjustments suggest that antivirus may be causing your problem, you have the following choices:* Adjust the exclusions in the antivirus software settings to stop the problem. %%* Turn off features in antivirus software that are not absolutely necessary. %% Some features are included to make the vendor look good against their compeition, but don't necessarily make you much safer.* Inform the antivirus vendor, and be persistent in getting past a canned response that their software is not at fault.* Find a different antivirus software or vendor that offers more reliable service.
= Problem Antivirus and Anti-Malware Packages =
Problems have been reported with:
= Unaffected Antivrus Packages =
The following programs have generally been observed as working reported to work well with Thunderbird . (but This is not proof that these products can't have problems):
*AVG Antivirus - (revised) from [https://getsatisfaction.com/mozilla_messaging/topics/avg_email_scanner_disabled] "[AVG] are no longer going to support the Thunderbird plugin because of the frequent updates of Thunderbird." And you may see problems with older versions (like 9.0.830). AVG may cause slow downloading of pop mail [http://gsfn.us/t/o1qa]. and AVG 9.0 may slow down sending with TB 3.1.x if set to scan outgoing messages) [http://forums.mozillazine.org/viewtopic.php?p=9663497#p9663497].
