Thunderbird Indicators Tell You If A Message Is For You, A Group, Or A Mailing List

You probably know about Gmail's Indicator setting which adds group and single message indicators to all mail folders. You can enable the feature with a click on the Settings button, the selection of Settings from the context menu and scrolling down on the page until you see the Personal level indicators preference.
The very same feature has now been ported to the Thunderbird desktop email client. The Personal Level Indicators extension for Thunderbird needs to be downloaded from the Mozilla website, before it can be installed manually in the program.
For that, you need to click on Tools > Add-ons to open the add-ons manager, and then on the small button next to the search field in the upper right corner. Select install add-on from file and select the add-on from your hard drive.
This add-on brings Google Mail's "personal level indicators" feature to Thunderbird. It displays little arrows next the email's subjects so you can tell if a message was addressed to you, a group, or a mailing list. A single arrow (›) indicates that a message is sent to you, and a group of others. A double arrow (») appears when the message is sent only to you. Arrows won't appear next to messages sent to a mailing list.
The add-on is installed, but you need to enable it in the interface before it becomes available. Right-click a column in the inbox and select the Personal Level Indicator option there. This enables the feature for the selected inbox. Keep in mind that you need to activate it separately for every folder that you want the extra information to appear.
Why would you want to display the indicator in first place? It may give you a quick overview about each email's recipients so that you can ignore emails send via mailing lists for instance and concentrate on personal emails instead. It can also be handy to see whether you'd need to use reply or reply all for a particular message.
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You said that Outlook isn’t your main email client, so which is your main one?
I think its thunderbird
It is Mozilla Thunderbird.
Awesome! This actually solved my problem… what a stupid bug.
If this is the same bug that I’ve encountered, there may be another fix: (1) hover over open Outlook item in Taskbar, cursor up to hover over Outlook window item, and right-click; (2) this should give you Restore / Move / Size / Minimize / Maximize — choose Move or Size; (3) use your cursor keys, going arbitrarily N/S/E/W, to try to move or size the Outlook window back into view. Basically, the app behaves as though it were open in a 0x0 window, or at a location that’s offscreen, and this will frequently work to resize and/or move the window. Don’t forget to close while resized/moved, so that Outlook remembers the size/position for next time.
THANK YOU Claude!!! I could get the main window to launch but could not get any other message window to show on the desktop. You are my hero!!!!
Solved my issue! 6 years later and this is still problem…
Fantastic. Thank you. Size did the trick.
This solved my Outlook problem, too. Thank you. :)
Thank you so much, this started happening to me today and was causing big problems. You are a life saver, I hope I can help you in some way some day.
You are a god – thank you!
thanks a lot…. work like charm.. :-)
Yah…thanks Claude. I’ve been having the same problem and tried all the suggestions…your solution was the answer. It had resized itself to a 0/0 box. Cheers
Excellent post. This had me baffled even trying to accurately describe the problem. This fixed it for me.
Thank you
Thanks a lot for the article. Don’t know why it happenend, don’t know how it got fixed, but it was really annoying and now it works :-)
Thanks a lot. I was facing this issue from past 3 week. I tried everything but no resolution. The issue was happening intermittently and mainly when I was changing the display of screen ( as i use 2 monitors). The only option i had was to do system restore. But thanks to you.
I’ve been tried to sole this problem for 12hours. Your comment about changing the display of screen helped me a lot!! Thanks!!
Thank you…don’t know why this happened but your instructions helped me fix it. Running Windows 10 and office pro 2007
Great tip! Thanks!
Worked for me, too – thank you!!!
It’s Worked for me, too
thank you very much!
I had a similar issue with Outlook 2013 on Windows 10 and this helped me to fix it. Thank you very much!
Thank you so much. Solved!
Considering you published this in 2012, incredible not been debugged by Microsoft.
Thank you again. M
This problem was faced by only one user logging to TS 2008 r2 using outlook 2010.The issue was resolved.
Thanks.
Great tip. Thank you!!!! If it helps, I had to use the Control Key and the arrow keys at the same time to bring my window back into view. Worked like a charm.
Thank you, this worked !!!!
Man, you are a fucking god. Thanks a lot, what an annoying bug!!
Awesome, this post solved the issue. Many thanks!