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Outlook signature keeps disappearing.

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I have successfully created my signatures for my Ymail, Gmail & Outlook.com accounts. For my Ymail & Gmail, they are working fine. But for my Outlook.com, Thunderbird keeps forgetting the signature each time I exited the app. The next time I use the Thunderbird, the Outlook.com signature is blank. Can you please help?

I have successfully created my signatures for my Ymail, Gmail & Outlook.com accounts. For my Ymail & Gmail, they are working fine. But for my Outlook.com, Thunderbird keeps forgetting the signature each time I exited the app. The next time I use the Thunderbird, the Outlook.com signature is blank. Can you please help?

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Is the signature an html, jpg or text file, or entered directly in Account Settings?

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The signature is entered directly in Account Settings. It works perfectly fine for my Gmail & Yahoo! Mail as Thunderbird can retain the signatures that I had created. Only the signature created for Outlook.com keeps disappearing.

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In Composition & Addressing in Account Settings for that account, is 'Compose messages in HTML format' checked?

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Yes - it is checked. When the Outlook.com signature is first entered directly, it worked fine. Only problem is that when I exit Thunderbird and then reopen the app, the signature is gone. Both my Gmail and Ymail signatures are still retained.