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change exchange 2010 multi tenant to exchange online

Posted on 2016-08-24
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Last Modified: 2016-08-29
We have our own exchange 2010 sp1 multi tenant environment where we want to move a client from our exchange to exchange online.

Everything goes well outside the domain, but within the domain, were the current exchange server still resided and their (old) mailbox, i have to manually add the mailbox settings, because autodiscover does not work, i think because there is a autodiscover setting in the dns.

Problem: every time when i add a new profile and add the new exchange server manually, with all the setttings, after a logoff and logon the settings are overwritten and the mailbox has become the old mailbox (exchange 2010 sp1) in stead of the new Exchange online one,

Anyone ?
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Question by:thisis_it
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Expert Comment

by:FOX
ID: 41768771
1.Did you set up your cname in DNS for the autodiscover https://support.microsoft.com/en-us/kb/2404385
2. Check which virtual directory it is pointing to https://technet.microsoft.com/en-us/library/aa996819(v=exchg.160).aspx
3. View ronnypot's solution here on EE:  https://www.experts-exchange.com/questions/28422993/Change-Autodiscover-settings-in-PowerShell.html
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Author Comment

by:thisis_it
ID: 41768776
Foxluv: your solution is about finding autodiscover, which works.

Problem is that my customer still has:

1) a mailbox on a multi-tenant exchange 2010 sp1 server in our cloud (domain)
2) when a new mailbox outside the domain (office 365) is created manually, the manual settings
are overwritten and it connects again to the old mailbox.
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Expert Comment

by:FOX
ID: 41768797
When you say connects again to the old mailbox do you mean it is connecting to on premise exchange?
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Accepted Solution

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thisis_it earned 0 total points
ID: 41768801
Solution found:

https://social.technet.microsoft.com/Forums/exchange/en-US/566616d9-d4c0-4d66-bf23-70541faf2c88/disabling-ad-autodiscover-while-migrating-to-office-365?forum=exchangesvradminlegacy

Solution:

Don't need to remove or disable mailbox on-premises exchange server. I removed two attributes from the AD "homeMDB" and homeMTA", just clear these attributes with in user's properties. And outlook autodiscovers the office 365 mailbox just like a dream.

Hope that helps.

Regards
Haseeb Dar
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Author Closing Comment

by:thisis_it
ID: 41774482
Solution by another website and user
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