I've been using BOTH for many years. Of late, Thunderbird is taking ages (well, minutes!) to move messages to Trash. I contacted Mozilla and they decided my AntiVirus was the problem, and suggested I look at: https://www.zonealarm.com/learning-center/antivirus-and-anti-spyware/#scan-exceptions or https://support.zonealarm.com/hc/en-us/articles/360060710091-Configuring-Scan-Exceptions But I wonder why, if it antivirus interference, why it's on the Trash move? And if I follow the ideas in these articles I'd be crippling ZoneAlarm. Suggestions welcome, please! Facebook Twitter LinkedIn -1