Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Email won't open.

  • 1 reply
  • 0 have this problem
  • 90 views
  • Last reply by Matt
  • Archived

Email won't open. Error message reads ' The application failed to start because it's side-by-side configuration is incorrect'.

Email won't open. Error message reads ' The application failed to start because it's side-by-side configuration is incorrect'.

All Replies (1)

Try simply reinstalling from Thunderbird.net

I do not know what the actual issue is, but in this case it is related to windows dynamic link libraries and a reinstall may be the solution. It is very rare I suggest a reinstall as for most folk it is just a distraction, but this time I think it is going to help.