Changes

Please add useful information about '''your''' experience with antivirus software (create a wiki account, and select edit).<br><br>'''Disclaimer: Problems may exist occur that are not listedhere, which is why we ask you to add informationyour experience. This The information here is anecdotal based on personal experiences, not based on a full (or any) an organized battery of systematic testing, and thus not definitive of what problems may or may not occur in your environment.'''

Typically, mild to severe performance issues when using mailbox files/foldersproblems. <p><br>'''WARNING: If your AV software worked for a previous version of Thunderbird ... that doesn't mean it works properly <u>now</u>with the newer version. If And, if Thunderbird is the only software affected ... itdoesn's not relevantt mean the problem can't be caused by antivirus. You must explicitly test by disable/enable of AV to determine if it's affecting the new effect on Thunderbird.'''

To test if the Antivirus and Anti-Malware software is causing a problem, disable it temporarily. For permanent solution of the problem you may need to disable parts of the software, change to different software, or exclude folder locations from scanning, which typically will be %appdata%\thunderbird\profiles **However, if you altered 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:

*Microsoft Security Essentials aka MSE (Settings | Excluded Files &amp; Folders | add \users\xxxx\appdata\roaming\thunderbird**) [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] {{Bug|621083}} [https://bugzilla.mozilla.org/show_bug.cgi?id=839908#c7 Bug 839908]