POP3 is still widely used today. However, an alternative protocol was created only a few years after the first version of POP.
The use of those security protocols will get disabled for POP 3 and IMAP 4 clients "by the end of April 2023." Organizations should move to using the more secure TLS 1.2 security protocol, if possible.
Pop3 vs. IMAP: Which is better IMAP is better if you are going to be accessing your email from multiple devices, such as a work computer and a smart phone. POP3 works better if you are only using one device, but have a very large number of emails.
The protocol is ideal when users need to access their email offline and they use a designated device for retrieval. POP3 is also useful for sending and storing bulk email messages.
POP3 is an older protocol that was originally designed to be used on only one computer. Unlike modern protocols that use two-way synchronization, POP3 only supports one-way email synchronization, only allowing users to download emails from a server to a client.
Your Emails are Processed Locally
POP3 doesn't synchronize your data across devices. It simply downloads your data to the device you're currently logged in to and processes everything on that device. So, if anyone can access that device or your storage drive fails, you're DONE with it.
POP3 is more secure than IMAP since it uses SSL/TLS encryption by default. This means that your passwords and email data are safe from eavesdroppers.
IMAP is more secure compared to POP3 if you care about data loss. IMAP creates several copies of your email and stores them on a remote server. So you can access them even when your local server is lost.
Leading email clients like Microsoft Outlook and Mozilla Thunderbird support IMAP over POP3. While POP3 servers can be secured to a certain extent, the fact that the protocol lacks support for most modern features makes it less secure than IMAP.
Replace POP3 with Office 365 Outlook Connector
This is nothing new; Microsoft has been announcing this for a long time already. However, now, there is also a definitive deadline: January 1st, 2023. What is POP3 POP3, often called Post Office Protocol, is a protocol for retrieving emails from a mail server.