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Up until 4/24 I was able to keep emails on my phone even after Outlook removed them from the web. Now as soon as they are removed, my emails on my phone vanish. I think my email was using a POP setting but was changed to IMAP by a tech. My phone automatically sets up IMAP when I try to set up an email account.
[Re-Titled by Moderator]
iPhone 6s, iOS 12
That sounds like your phone was switched from POP to IMAP. You will need to delete the account, then add it back as a POP account. That's a little tricky; here are some instructions-->Forcing creation of a POP or IMAP email a… - Apple Community
That sounds like your phone was switched from POP to IMAP. You will need to delete the account, then add it back as a POP account. That's a little tricky; here are some instructions-->Forcing creation of a POP or IMAP email a… - Apple Community
Even as a POP account, you can still tell Outlook to leave retrieved emails on the server.
With Outlook open, choose Tools > Accounts… from the top menu bar. Click on the Advanced button at the lower right. Check the top box.
Something to note... not every provider supports POP. Your account may have been forced to IMAP.
Except the phone had previously been a POP account, so unless the provider suddenly stopped supporting it at the same time a tech set up the phone as IMAP they probably still do.
Keep emails on my phone even after Outlook remove them from the web
