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The steps I followed to get to the error: 
 
Firstly it was to complete the first phase via Windows Azure Powershell (running as admin): 
 
1) Run powershell as an admin 
2) $LiveCred = Get-Credential 
3) $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri <a href="https://ps.outlook.com/powershell/" rel="ugc">https://ps.outlook.com/powershell/</a>&nbsp;-Credential $LiveCred -Authentication Basic –AllowRedirection 
4) Set-ExecutionPolicy Unrestricted -Force 
5) Import-PSSession $Session 
 
That all worked fine so I then moved onto the next phase and starting entering these things: 
 
1) Get-Mailbox bill 
2) $user.EmailAddresses+=”X500:/o=VVT/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=useralias” 
3) Set-Mailbox username –EmailAddresses $user.EmailAddresses 
4) Get-Mailbox username | FL emailaddresses 
 
The error I got was when I tried to copy the stuff in step 2 - I suspect I need to put something in place of EmailAddresses but I don't know what.
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Thanks I have applied that without errors - Awaiting confirmation from the user and will update.
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No comment has been added to this question in more than 21 days, so it is now classified as abandoned. 
 
I have recommended this question be closed as follows: 
 
Split: 
-- Vasil Michev (MVP) (<a href="https:#a42367193" rel="ugc">https:#a42367193</a>) 
-- Vasil Michev (MVP) (<a href="https:#a42367342" rel="ugc">https:#a42367342</a>) 
 
 
If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above. 
 
seth2740 
Experts-Exchange Cleanup Volunteer
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My Co-Worker has completed the migration steps to move a customer from Exchange 2007 (on old Windows Server) into the 365 platform which is fine however the customer is complaining that calendar appointments etc are getting screwed up. Turns out its because the X500 addresses are not in place. 
 
My co-worker tried to import the X500 addresses as per these instructions: 
 
<a href="http://zytelnetworks.com/kb/?p=273" rel="ugc">http://zytelnetworks.com/kb/?p=273</a> 
 
However when we get to this bit it goes wrong 
$user.EmailAddresses+=”X500:/o=VVT/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=useralias” 
 
Powershell throws an error 'EmailAddresses' cannot be found on this object 
 
I am sure its something really simple but I am very much out of my depth with this stuff so please treat me as a complete novice in your replies! 
 
Thanks
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My Co-Worker has completed the migration steps to move a customer from Exchange 2007 (on old Windows Server) into the 365 platform which is fine however the customer is complaining that calendar appointments etc are getting screwed up. Turns out its because the X500 addresses are not in place.

My co-worker tried to import the X500 addresses as per these instructions:

http://zytelnetworks.com/kb/?p=273

However when we get to this bit it goes wrong
$user.EmailAddresses+=”X500:/o=VVT/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=useralias”

Powershell throws an error 'EmailAddresses' cannot be found on this object

I am sure its something really simple but I am very much out of my depth with this stuff so please treat me as a complete novice in your replies! 

Thanks

Help! Importing X500 into Office 365 post 2007 migration

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.