We have taken the decision to host our company email with Outlook.com using our custom domain (domains.live.com), we have 16 accounts and every email on those accounts is very important. At the time that we change the MX record of our domain to point as directed by domains.live.com, all accounts will stop receiving its corresponding emails. Our question is the following:

Is it possible to update the MX record as indicated by domains.live.com, confirm ownership of the domain to get it activated, and as soon is confirm as activated, change the MX record back to the old server so no emails are lost, then go calmly into domains.live.com and create all the accounts (about 16) and when they are all created, then change back the MX record as directed by domains.live.com.

We are planning to do the transfer this weekend, so your attention to this question will be greatly appreciated.

Thanks in advanced.