Situation: At work the main email account is a standard Gmail. Let's call it email@example.com. There are 4 people whom all pull/share the same main account. To avoid confusion with the inbox we have it setup as a POP account with the username box under Mail preferences saying recent:firstname.lastname@example.org. This allows us to not affect each other seeing every message and the ability for 4 of us to read and delete emails without others losing them as well. It has worked for many many years exactly like this until today. I updated my machine to 10.10.3 and it essentially broke the ability to have a POP account. It appears that because Internet Accounts (under System Preferences) is handling all logins with the new sheet pop down that requires you to login through a mini-browser it cannot authenticate the additional settings that Mail was normally handling. I spoke with Apple for a few hours in the AM to see if there was any resolution or workarounds and was told by a Mail Senior Advisor that essentially POP isn't supported in the Beta and he couldn't confirm if there were definitive plans to include it once the general release hits. "IMAP is easier for customers to setup" - sure but what about those of us that have additional settings inputted or those that don't need their hand held when setting up an email client? The workaround for me is to completely restore my machine and go back to 10.10.2 and keep my fingers crossed that they resolve the issue with Mail not being able to push any settings to Internet Accounts. If anyone has a better setup where multiple users can use Apple Mail with a singular Gmail account I would love to know. POP and the recent: add-on were the most effective way to accomplish this but that was a long time ago. It is important that everyone receive each email and be able to handle it their own way without affecting others as well as having the ability to compose and email from that account to respond to clients. I have thought about forwarding all the mail to each persons email@example.com address but we lose the ability to respond using the main account. For the moment if you use POP with Gmail for any reason DO NOT UPGRADE!