I agree with the reponses here as well. As for the email loss. That really depends on your current and new host providers. For instance, many times, depending on the control panels, the new host can transfer your mail for you providing you have access to it on ther old server (at server level). Not everybody does, so you should check with your old host.
If you just have one domain and one mail account, you could leave your Outlook running, accepting mail during the nameserver change over, and that way, all mail sent to your old host up to the point of resolution, would be picked up. Obviously too, make certain you have not saved any email on the old server, especially if you use webmail.
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