They are two different protocols. Post Office Protocol, which works like a post office box, where you go to get your mail, and Internet Message Access Protocol, which works by synchronising with the server. In most cases, I recommend IMAP. These pages may help you decide:
Sure, some fresh injuries might hurt for a short time frame. However, unless there is a definitive neurological link, these will heal and the pain should stop. If not, then there is a good chance that the pain is not due to the herniated disc at all. So, some herniations can heal, some may not. Degeneration never heals. However, statistics show that healing is not needed in order for the back or neck symptoms to resolve.
Disc degeneration or slippage (herniation) can heal and stop hurting- if you let it - no differently than a sprained ankle. Stop damaging your discs with bad bending, standing, and sitting habits and your discs can heal. It takes years to herniate a disc, and only days to weeks to let it heal it by stopping bad habits.