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Small and medium-sized companies can achieve three benefits from using Microsoft Exchange. Centralise emails so that they can be backed up. If you're using an old POP3 model, you risk losing your emails. Exchange is first and foremost about centralising and backing up that information.
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. It is also better if you have a poor internet connection and need to access your emails offline.