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→Problem Antivirus and Anti-Malware Packages: Microsoft Windows Defender
= Problem Antivirus and Anti-Malware Packages =
To test if the Antivirus and Anti-Malware software is causing a problem, disable it temporarilyor run 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''' **HoweverNOTE, 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:
*McAfee {{bug|544684}} shutdown hang, [https://getsatisfaction.com/mozilla_messaging/topics/thunderbird_is_slow_to_launch slow startup], {{bug|1015437}} Slow getting mail
*Microsoft Security Essentials aka MSE (Settings | Excluded Files & Folders | add [https://support.mozillamessaging.com/en-US/kb/profiles#w_where-is-my-profile-stored your profile folder], typically c:\users\-your-user-name-\appdata\roaming\thunderbird **) [http://getsatisfaction.com/mozilla_messaging/topics/thunderbird_very_slow_with_microsoft_security_essentials?utm_content=reply_link&utm_medium=email&utm_source=reply_notification#reply_12390513] [https://getsatisfaction.com/mozilla_messaging/topics/thunderbird_slow-yvp58] [http://groups.google.com/group/mozilla.support.thunderbird/browse_thread/thread/93ab6d849bd87918] [http://groups.google.com/group/mozilla.support.thunderbird/browse_thread/thread/84767c1397f8d560/d2ec367b9d781522?lnk=raot] [https://getsatisfaction.com/mozilla_messaging/topics/thunderbird_very_slow_with_microsoft_security_essentials] [https://getsatisfaction.com/mozilla_messaging/topics/thunderbird_very_slow_on_one_system_and_fast_on_another] {{Bug|621083}} [https://bugzilla.mozilla.org/show_bug.cgi?id=839908#c7 Bug 839908]
* Microsoft Windows Defender [http://answers.microsoft.com/en-us/protect/wiki/protect_defender-protect_scanning/how-to-exclude-a-filefolder-from-windows-defender/f32ee18f-a012-4f02-8611-0737570e8eee how to exclude Thunderbird]
*Panda Cloud Anti Virus Free v 2. Installed but it interfered with sending emails. Thunderbird v 24.3.0 said it could not access the temp directory although the outgoing emails were there. Thus the mail was not sent. No apparent tweaks worked. When Panda uninstalled, Thunderbird was back to normal.
*pctools internet security 2011 {{bug|610106}}
