I think for GMAIL you should do it, BUT this is only me.
Maybe I'm wrong.

>Does it mean that I need to remove my POP/SMTP from Outlook and add it as IMAP?
>
>>Google had setting for "Less secure Applications" which is mentioned in this link.
>>They do not have it now.
>>So I don't think POP3 will works with GMAIL SMTP.
>>
>>>What is "Less Secure Apps"? I wonder if my Outlook (part of the MS 365) is such an application.
>>>
>>>>I'm not sure that this link is helpful, because Google stopped Less Secure Apps from 1st of June this year.
>>>>
>>>>
>>>>>Thank you.
>>>>>
>>>>>>I ran into this problem about a month ago. Tried a bunch of different things to get POP to work again but never was able to get it going again -- finally resorted to changing ti IMAP. I spent a fair amount of time googling and tried a bunch of suggestions. Hopefully someone has an answer for this as I prefer POP3 or IMAP too.
>>>>>>
>>>>>>Might make sure you have this done...
>>>>>>https://support.google.com/googlecloud/answer/10661442?hl=en#:~:text=If%20it's%20been%20a%20long,it%20is%20not%20already%20enabled.
>>>>>>
>>>>>>
>>>>>>>Hi,
>>>>>>>
>>>>>>>Since this morning, my Outlook does not connect to Gmail accounts.
>>>>>>>
>>>>>>>Currently my Gmail emails (in Outlook) are set to use POP/SMTP. Do I need/have to change it to IMAP?
>>>>>>>
>>>>>>>TIA