Using classic Outlook for Windows in business environments
Hi, my name is Neil, and I'm an Outlook user like you.
I'll be happy to answer your question.
Sorry you're receiving this blue screen asking you to make a choice between which email account you want to use to send the email from.
Please can you try following these instructions and see if we can get this resolved.
We need to make sure one of your email accounts is the default email account.
To do this:
Click on File > Account Settings > Account Settings.
From the list of accounts on the Email tab, click on your preferred default email account to select it.
Click "Set as Default".
Click the "Close" button.
Now that you have selected your default email account, we can set this account to be the email account you use as the default to send new messages.
To do this:
Click on File > Options > Mail.
Under the 'Send Messages' section, check the box that says "Always use the default account when composing new messages".
Click on "OK".
Now when you go to compose a new email or reply to an email, you should see your default email address is automatically selected as the account that will send the email.
Let me know if this works for you.
Kindest regards,
Neil