Microsoft CRM online transition -- how do I set user IDs to email addresses instead of new onmicrosoft IDs?

Hello Experts!

I have a small CRM online installation through dynamics. At my shop we are used to accessing CRM by signing in with our live accounts, which correspond to our email addresses (user@ourcorp.com). Now, the transition wizard made me pick user@longassname.onmicrosoft.com as our user ids.

One of my big problems is I'm not as up on o365 as I should be, but catching up with anything has been a problem as of late, so please forgive any blatant ignorance I'm displaying.

Our 'partner' for 0365 is almost as clueless as me, but the CRM billing support guy said it would be easy to configure our ourcorp.com domain in our 365 account, and thereby let users use the old ID they were used to signing in with. However the tech person at microsoft I was passed to has been 100% impossible to reach in person.

Believe me when I tell you my users are nice people but will NOT get a new id.

Is this actually possible? Can it happen quickly? Could someone give me an idea of what is involved? I assume I have to setup our ourcorp.com domain on 365, then do some kind of federation services?

I'd love to get a headstart on this as soon as possible, since the microsoft tech isn't being very responsive.

thanks so much for all your help!!
scox72Asked:
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Vasil Michev (MVP)Connect With a Mentor Commented:
Have you added and verified your custom domain (ourcorp.com) to Office 365? If not, you need to do this first, there is lot of info available on how to do so, for example:

http://office.microsoft.com/en-001/office365-suite-help/add-your-domain-to-office-365-HA102818660.aspx

Once you have added the domain, not only you can add email aliases in the form user@ourcorp.com, you can also change the login name to match this format. All you need to do is to login to the O365 Portal, Navigate to the admin section, Users and groups on left, click on the user, select Details on the left and under UserName, you will find that additional domain. Change the value there, press Save and you're good to go.

You can also perform the same procedure on multiple users at a time, just select all of them via the checkboxes, then on the right click the Edit button (the Pen-like icon) and under Domain, select the one you want to use. You can skip the next sections and just confirm the changes.
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scox72Author Commented:
[edited out a dumb question]

Vasilcho, you're my hero.

So...we just did this CRM transition wizard ... I assume the transition is going to migrate all our users, so we have to wait for this to happen to change the usernames?

Thanks! you're the best!
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Vasil Michev (MVP)Commented:
No idea, I've never actually seen CRM upgrade in process :)

If you have already added the domain, and this part of the portal is not locked due to the upgrade process, you dont have to wait.
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