reference Mozilla Thunderbird (not obsolete Mozilla LightningHEADmaster

1 files changed, 1 insertions, 1 deletions

diff --git a/USE.md b/USE.md
index cc1cf92..d73fca1 100644
--- a/USE.md
+++ b/USE.md
@@ -21,7 +21,7 @@ eventhost: event.example.org
 Recommended calendaring client depends on the operating system you use:
 
   * Mac, iPhone and iPad: Apple Calendar
-  * Windows and Linux: [Mozilla Lightning](https://www.mozilla.org/en-US/projects/calendar/)
+  * Windows and Linux: [Mozilla Thunderbird](https://www.thunderbird.net/)
   * Android: [DAVdroid](https://f-droid.org/app/at.bitfire.davdroid)
     and [ICSdroid](https://f-droid.org/app/at.bitfire.icsdroid)