Cannot change Office 365 connected account to POP

I have a Office 365 user mailbox to which I want to attach an external email via POP3.

Whenever I enter the email address and pasword for this external mailbox it connects automatically via IMAP and mail starts flowing in the Office 365 mailbox. But I don't want this. I want POP3 so the external mailbox is purged upon retrieval.

My question is how can I default to POP3.
FrankBusiness OwnerAsked:
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Vasil Michev (MVP)Commented:
You can create a new subscription via POP3 using the New-PopSubscription cmdlet:
FrankBusiness OwnerAuthor Commented:
Thanks for responding.

When I try to use the cmdlet i get an error:

New-PopSubscription : The term 'New-PopSubscription' is not recognized as the name of a cmdlet, function, script file,or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

I used this command:
New-PopSubscription -Name "xxxxxxx" -EmailAddress -IncomingUserName -IncomingPassword (ConvertTo-SecureString -String 'abcd1234' -AsPlainText -Force) -IncomingServer  -IncomingSecurity Ssl -IncomingPort 995
Vasil Michev (MVP)Commented:
Well you need to connect PowerShell to Exchange Online first:

Sorry for skipping that part, I always assume people know stuff that has become routine to me :)

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FrankBusiness OwnerAuthor Commented:
Thanks Vasil. I finally got it.

There were also some other parts to my solution , therefor i'll put the complete solution to aid other users in my position. These are the complete steps I followed:

- Opened powershell as an administrator

PS C:\Windows\system32> $UserCredential = Get-Credential
PS C:\Windows\system32> $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $UserCredential -Authentication Basic -AllowRedirection
PS C:\Windows\system32>Set-ExecutionPolicy RemoteSigned
PS C:\Windows\system32>Import-PSSession $Session
PS C:\Windows\system32>New-PopSubscription -Name "xxxxxxx" -EmailAddress -IncomingUserName -IncomingPassword (ConvertTo-SecureString -String 'P@ssw0rd1' -AsPlainText -Force) -IncomingServer  -IncomingSecurity none -IncomingPort 110
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