How do I receive/keep messages on phone after Outlook receives them?

[goarmy]

I have a POP3 account and use Outlook on my PC to send/receive emails.

I just got a Nexus 5 and am trying to configure AquaMail to receive emails.  However, whenever my Outlook receives a new email first, I don't receive it on my phone.  Similarly, if I receive the email on my phone first, it disappears when Outlook eventually receives it.

I want to be able to receive/manage emails on both my PC and phone.  How do I configure the settings to do this?

Thanks in advance for your help.

[Kostya Vasilyev]

Sounds like your Outlook is configured to delete messages from the mail server when it checks mail.

You will want to turn this off.

[gapi]

I want the opposite. I have a Nexus 5 and after downloading, viewing, and even deleting my messages in Outlook 2007, they stay on the Nexus 5. I want AquaMail to sync and see they are gone and reflect that.

In Outlook 2007 I have Tools/Account Settings/Double click on the account/More settings/Advanced tab/Leave copy of messages on server "Un-checked". 

[goarmy]

That did the trick.  Thanks.

[Kostya Vasilyev]

@gapi --

By default, this logic is disabled for POP3 and enabled for IMAP and EWS.

Long press the account -> options and folders -> account options, enable "Remove deleted".