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How do I STOP thunderbird from being the default mail client?

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I recently upgraded my version of thunderbird and it has decided it is to be my default email program. This is really annoying. I use thunderbird for 1 email account and all other email accounts are handled by MS Outlook 2010.

How do I tell thunderbird it is NOT the default email program?

I recently upgraded my version of thunderbird and it has decided it is to be my default email program. This is really annoying. I use thunderbird for 1 email account and all other email accounts are handled by MS Outlook 2010. How do I tell thunderbird it is NOT the default email program?

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From the Menu Bar select Tools-Options-Advanced-General

Under System Integration uncheck the box to always check to see if Thunderbird is the default.

No menu bar? Press the alt key.

Then tell Outlook it is the default.