pop3 to imap

I was told that it's safer to stay on POP3, than it would be to move to IMAP / Exchange / etc..... I am just wondering if there's any truth in that? Can hackers still get into your mailbox, even with 2 step turned on? Context: I use Fastmail with 2-Step ON with Authenticator App for...

In an effort to access all email accounts via all devices (W10 PC + Laptop plus Android phone + tablet), I changed all from POP3 to IMAP. Now it seems all my contacts are gone! Disastrous for my small 15 year old business. Where have I gone wrong? TIA, Eileen

I am troubleshooting for my out of town sister who has a new laptop, configured for her by Best Buy. She previously had Outlook 2013 and within her single PST file, she retrieved mail from multiple accounts. With the new Outlook 2016, Best Buy told her that the only way to manage the multiple...