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Sync O365 and Active Directory Passwords

Hi Experts,

My company is considering migrating from our aging on-premise Exchange server to Exchange online via Microsoft's O365 offering. One of the issues that our consultant has described to us is that when we migrate there isn't a good way to sync passwords with our on-premise active directory server. Essentially, he said there is a way to sync the two, but if the internet connection or domain controller on premise go down, it will kill our email service (which removes one of the biggest benefits of moving to the cloud). Is this the case? Is there a way to sync passwords, without having email dependent completely on the on-premise setup?

I find it difficult to believe large companies would put up with this. I'm hoping my question makes sense and that there's a good way to do this! Thank you for your help!
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ttotus
Asked:
ttotus
1 Solution
 
Vasil Michev (MVP)Commented:
There are two methods:

1) configure AD FS, which will allow for Single Sign On and better user experience, but will be more dependent on the on-prem infrastructure

2) use only dirsync with password sync, which will allow the users to login with the same password they use on-prem. This scenario is know as Same sign on.

You can read about the differences here:

http://blogs.office.com/b/office365tech/archive/2013/07/26/password-hash-sync-simplifies-user-management-for-office-365.aspx

Both solutions rely on on-prem servers. If the dirsync server goes down, it will still allow you to access the services. If the AD FS server goes down however, you will not be able to login.

For small company, option 2 is probably best. Larger ones will most likely want to take advantage of the benefits SSO offers.

And just to make it clear, AD FS can be configured very easily for LB and HA, so even if a single server (or all servers in a particular site) goes down, the users will still be able to login.
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ttotusAuthor Commented:
I really appreciate the quick response. Great information -- Thanks again!
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