How to stop Outlook 2010 from registering itself as the default email client over and over again?

Posted by Tobias Kienzler on Super User See other posts from Super User or by Tobias Kienzler
Published on 2012-11-29T08:04:56Z Indexed on 2012/11/29 17:07 UTC
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Filed under:

windows-7

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outlook

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thunderbird

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outlook-2010

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system-settings

I'm usually using Thunderbird, but for testing purposes have to start Outlook every now and then. Afterwards, Thunderbird informs me that it is no longer the default client, which it should have remained.

How to stop Outlook 2010 from being so insolent?

edit In fact, Outlook does not change any of the settings I checked so far (it doesn't re-register files, and mailto: links still open Thunderbird, so I'm rather confused at what Thunderbird considers to be modified by Outlook

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