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

EWS installation blocked, because it is unsigned.

  • 2 replies
  • 1 has this problem
  • 8 views
  • Last reply by christ1

Both ExQuilla and Mozilla experts in the forum recommend using the EWS exchangecalendar add-on (version 3.8.0) to sync with a Microsoft Exchange Server. However, when I tried to install it, it was blocked (in Firefox) because it is unsigned. Two older versions (3.6 and 3.5) also don't work. What is going wrong?

Both ExQuilla and Mozilla experts in the forum recommend using the EWS exchangecalendar add-on (version 3.8.0) to sync with a Microsoft Exchange Server. However, when I tried to install it, it was blocked (in Firefox) because it is unsigned. Two older versions (3.6 and 3.5) also don't work. What is going wrong?

All Replies (2)

So I fixed the installation, but the syncing doesn't work. I have no calendar data. DavMail didn't work, either.

it was blocked (in Firefox)

It's a Thunderbird add-on, and it certainly won't work if you attempt to install it in Firefox. See http://xenos-email-notes.simplesite.com/416814616

the syncing doesn't work. I have no calendar data.

See https://github.com/Ericsson/exchangecalendar/wiki/Posting-new-issues-(instructions)

Modified by christ1