JoinDomain VMExtensionProvisioningError when deploying WVD (aka Conflict Error)

Deploying WVD Fails with a conflict error and when clicking for more information it presents a conflict and not much else that is useful by way of toubleshooting. Hopefully this helps someone else as it had me head scratching for a little while.. When creating the Host Pool, make sure that you haven't made the fatal error of using the Azure Active Directory Credential INSTEAD of the Local AD Domain Credential.  i.e do not use USER@m365xxxxx.onmicrosoft.com to domain join, even if it links back to the domain - this is where the conflict arrises.    Instead, use your full internal domain UPN.  USER@prefix.domain.co.uk  Re-deploy your same configuration and you should find it goes through now without any problems. Additional findings.... Albeit my mistake above was an easy one, it does appear the error is directly linked to the domain join process. If you go into your resource groups, locate the session host and MSTSC directly to it.  Try the domain join pr

Red Cross or Blank compose window in Outlook Web Access

This I have seen happen many times and the answer is very simple, It mostly happens on clients running Windows Vista, you will find that in Vista, Microsoft changed the way it uses the Active X control and so you need to update the server with a more recent component.

This applies to Vista and Exchange Server 2003

This update is freely available from microsoft here:
http://support.microsoft.com/kb/911829

P.S I Have seen this when you are using IE7 on XP for some reason so this may still apply if that is the case with you.

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