Announcement: Owl: Exchange support for Thunderbird

Ben Bucksch ben.bucksch at
Thu Nov 15 02:42:59 UTC 2018

Hello all,

we've been working hard on this, and we're ready for a first public beta 

You can download the XPI <> from my 
website <> and install it in the TB addon 
manager. You need at least TB 60.3 or Thunderbird 64 beta, earlier 
versions will not work.

Go to the Addon settings to add an Exchange account.

If you encounter bugs, please email me privately, with a detailed 
reproduction, symptoms, and your Exchange domain.

Looking forward to hear from you!


Ben Bucksch schrieb am 11.10.18 um 17:30:
> If you would like to read your email on a Microsoft Exchange server 
> account using Thunderbird, there are a currently 2 main possibilities:
>   * If the Exchange server has IMAP enabled, you can connect via IMAP,
>     after manually setting up the account
>   * ExQuilla, a Thunderbird addon, uses the EWS propietary protocol of
>     Exchange.
> However, for a large number of corporate Exchange servers of large 
> companies, these 2 protocols are not enabled towards the Internet. 
> Oftentimes, only Outlook Web Access (OWA), the webmail frontend of 
> Exchange, is enabled. This rules out both options above and leaves you 
> without access in Thunderbird.
> There are some other protocols that Exchange supports, e.g. the native 
> Microsoft Outlook application protocol, or ActiveSync, but none of 
> these have an implementation in Thunderbird.
> So, with my company, we have been developing a Thunderbird addon that 
> uses the OWA protocol to connect to Exchange servers. This should 
> allow to read and write email in Thunderbird with your Exchange 
> account that has OWA enabled. The name of the new extension is Owl.
> We are currently in the early alpha stages, where we test internally 
> and fix bugs. We should be going into beta soon. We are currently 
> fixing bugs and other roadblocks in Thunderbid to make this happen and 
> working with Thunderbird developers to integrate these patches.
> Ben Bucksch
> Beonex

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