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I want connect my Outlook to Office 365 without change (yet) the MX record. On Outlook I've already an IMAP account to the current mail server and I want copy and paste only a few email manually. When all will work I'll change the MX record and I'll switch the current mail server off.

I've changed my record autodiscover.mydomain.com to autodiscover.outlook.com but unfortunately I can't authenticate on Office 365 because my default address (domain) at present is mydomain.onmicrosoft.com and not mydomain.com. I can't change default domain because I've not changed the MX record..

techraf
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CSG
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    Change the username in Office365 to be myuser@mydomain.onmicrosoft.com, then use this username when setting up the account in Outlook. Should work fine. – jlehtinen Apr 16 '15 at 13:46
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    P.S. Microsoft support for Office365 is (surprisingly) excellent and opening a ticket with them would get you help with this very quickly. – jlehtinen Apr 16 '15 at 13:56
  • Thanks for the answer. If I use myuser@mydomain.onmicrosoft.com for the authentication when i'll change the MX record (and my default domain on Office365 ) all authentications will fail again and i'll have to reconfig quickly all clients manually. I don't want do this work twice! – CSG Apr 18 '15 at 08:39

2 Answers2

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The answer to your question goes into two parts:

  • Change the domain name: As far as I know, you can change the default domain name of your subscription without the need to add an MX record. so you may need to look again at your setup and insure that you have followed the steps to configure the domain correctly.

Step 1: https://support.office.com/en-au/article/Verify-your-domain-in-Office-365-6383f56d-3d09-4dcb-9b41-b5f5a5efd611?ui=en-US&rs=en-AU&ad=AU

Step 2: https://support.office.com/en-au/article/Change-your-default-domain-for-email-in-Office-365-1bd69e1c-9598-49ce-b341-9ac895dbe681

  • Email migration: why are you doing it the hard way? since you're clients are running on IMAP, perform an IMAP migration, it take a bit of time to setup but it can't get easier than this, your users won't need to be reconfigured twice but only once, once they login into their new email they will have immediate access to their inbox.

IMAP Migration Steps: https://support.office.com/en-us/article/Migrate-your-IMAP-mailboxes-to-Office-365-3fe19996-29bc-4879-aab9-5a622b2f1481

Noor Khaldi
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  • now i' ll test your answer. – CSG Apr 20 '15 at 07:59
  • I can't use IMAP migration because this method have a limitation: a folder must have less than 500k items.. and i've to manage few users with a mail box over 20GB!! – CSG Apr 20 '15 at 08:03
  • i'm sorry but your solution does not work! selecting my ".com" domain does't appear the command "set as defaut". is it generated by the DNS errors? – CSG Apr 20 '15 at 09:17
  • Your problem is different than the question title, I suggest you do more reading 1) you may for sure add a new domain name and verify it without the need to create an MX record: https://technet.microsoft.com/en-us/library/hh852557.aspx 2) I would highly suggest that you go through the Office 365 OnRamp tool: http://blogs.technet.com/b/msukucc/archive/2013/10/14/office-365-onramp-autochecks.aspx – Noor Khaldi Apr 20 '15 at 20:01
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You may alternately connect via Exchange by editing your host file, it works great.

A useful tip for how to upload PSTs before cutting over the MX record:

  1. execute ping autodiscover.outlook.com and then note the IP address you get
  2. then run notepad AS AN ADMINISTRATOR
  3. then open your hosts file from directory C:\Windows\System32\drivers\etc\

  4. using the ip address from step 1 instead of 192.0.2.1, and using your own domain (what is after the @ symbol of your Office365 email address) instead of example.com, add this line to the file :

    192.0.2.1 autodiscover.example.com

Outlook should work fine now even without setting up your DNS or switching over the mx record yet.

This is useful for uploading PST files from our office before switching over the mx records when migrating to Office 365.

Don’t forget to delete the line from the hosts file once the DNS records have been fully setup.

Law29
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David Levine
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