It is only important if you use your device for work and your office has a Microsoft Exchange mail server. Exchange allows you to sync your email, contacts, calendar and tasks with a mobile device utilizing push technology, which means that as a new email arives for you on the server you automatically get a copy on your phone.
I have an Exchange server at my office so I use Moxier Mail for syncing with it for my corporate emails, calendar and contacts. I use the Gmail app on my Moment for my Google mail account. I also use the general email client on my Moment for my personal email from my hosted server (rainfreak.com). The Gmail and general email client both have to check for new messages, which do so at set intervals (1,5,10,30 minutes, etc). Moxier, on the other hand, doesn't check for messages but rather notifies me when a new message is pushed to me from the Exchange server.
You can read more about Microsoft Exchange, see a working demo, and watch videos about it
here.
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