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'''This article is not just about performance issues.''' Please add information about '''your''' experience with antivirus software (create a wiki account, and select edit).<br><br>'''Disclaimer: Problems may occur that are not listed here. So we ask you to add your experience. The information here is anecdotal based on personal experiences, not based on an organized battery of testing. You can help other users by please adding your own experience.'''
= Symptoms =
Possible symptoms:* Mild to severe performance problems. <p><br>'''WARNING: Your AV software probably has worked fine for ages in previous versions of Thunderbird. That's not a guarantee for current or future versions of the AV or Thunderbord. It can easily NOT work properly <u>now</u> with a newer Thunderbird - even if Thunderbird is the only software affected, even if your AV version did not change. ''You must explicitly test by disable/enable of AV to determine the effect on Thunderbird.'' The quickest way to test, is * Not able to [https://support.mozilla.org/en-US/kb/safe-mode start Windows in safe mode].'''get new mail<br><br>'''Example problem areas:''' * OS hangs and crashes
Including but not limited to doing the following:
* Opening a message
* Downloading or attempting to get new messages
* Moving messages to a different folder
* Opening file attachments
* Displaying a message
* Images not displaying. [http://getsatisfaction.com/mozilla_messaging/topics/what_happened_to_progress_with_new_versions_going_backward#reply_3328214 Sometimes anti-virus programs block 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 System Proxies which block or slow down all internet connections including sending and receiving email, images in email and web browsing]
* Thunderbird startup
{{Warning|Your AV software probably has worked great for ages in previous versions of Thunderbird. That is NO guarantee that it will work well in a new or any future version of AV or Thunderbird. When either one changes version there can be interaction problems - even if for you Thunderbird is the only software affected, 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 =
The quickest way to test in impact of other software on Thunderbird is to [http://bit.ly/1MU6eMa start Windows in safe mode].'''
{{Warning|Your AV software probably has worked great for ages in previous versions of Thunderbird. That is NO guarantee that it will work well in a new or any future version of AV or Thunderbird. When either one changes version there can be interaction problems - even if for you Thunderbird is the only software affected, 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].'''}}
= Problem Antivirus and Anti-Malware Packages =
To test if the Antivirus and Anti-Malware software is causing a problem, disable it temporarily or run [http://bit.ly/1MU6eMa Windows in safe mode]. For permanent solution of the problem you may need to disable parts of the software, change to different software, or exclude Thunderbird profile folder locations from scanning, which typically will be '''%appdata%\thunderbird\profiles''' **NOTE, if you altered default profile location or Thunderbird accounts to put mail somewhere on disk other than the standard profile location, you will need to also exclude those nonstandard locations.
Problems have been reported with:
If you are uncertain that McAfee is the cause, you can test whether something started during Thunderbird or Windows startup is involved:
* Start MS-Windows in safe mode
* Sith With Windows in safe mode, start [https://support.mozilla.org/en-US/kb/safe-mode|Thunderbird in safe mode].
If the problem is gone then you must dig to find which Windows installed program or Thunderbird addon is causing the problem.
