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why does T-bird keeping asking to set default mail client with windows 10

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I am a long time user of Thunderbird. With the installation of 45.5.1 I keep getting a notice to select my default email client -- I have done this over and over with Windows 10. But the pop-up keeps appearing each time I start T-bird. Is this a Windows 10 issue or a T-bird issue.

I am a long time user of Thunderbird. With the installation of 45.5.1 I keep getting a notice to select my default email client -- I have done this over and over with Windows 10. But the pop-up keeps appearing each time I start T-bird. Is this a Windows 10 issue or a T-bird issue.

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Are you starting another email clients in addition to Thunderbird, which registers itself as the default mail app? E.g. Outlook does this.