How can I set msExchMailboxGUID attribute to null?

How can I set msExchMailboxGUID attribute to null?

Issues in attempting to migrate from on-premise Exchange

When migrating from on-premise Exchange to Exchange Online, you receive the following error:

This is due to the user's msExchMailboxGUID attribute in the system pointing to the old on-premises mailbox value, after being synced from Active Directory to Azure Active Directory.

Resolution:

This can be set within Synchronization Rules Editor in Azure AD Connect. Run the Synchronization Rules Editor as an administrator.


Click on In from AD – User Exchange to edit the Inbound Rule Type.

Select Transformations. Find the msExchMailboxGuid attribute. Change it to the following:
Expression - msExchMailboxGuid - NULL - Checkmark Apply Once - Click on Update.

At this point, perform a full synchronization with Azure AD Connect.

Now users may be assigned an Exchange Online license, and your Migration tool may be used to migrate their mailboxes to Office 365.

    • Related Articles

    • Blocking emails in Exchange Admin Center does not work

      Emails that are blocked are still delivered There are times when user mailboxes still recieve emails from addresses or domaisn that have been blocked in Exchange Admin Center. Office 365 spam filters will mark this message as spam, however the mail ...
    • Set up work email accounts that use Office 365 in Android app

      Revised by Israel Cenir Nature of Update Confirmed this is still active process Date of Revision 28/10/2022 Tap Settings > Accounts > Add account > Email. Type your full email address, for example tony@contoso.com, type your password, and then tap ...
    • rhipe Granular Delegated Admin Permissions (GDAP) Policy and Process

      rhipe is committed to the new Granular Delegated Admin Permissions (GDAP) for partners being rolled out by Microsoft. Unfortunately, the implementation by Microsoft requires that each relationship is commenced from a unique and time-limited URL, and ...
    • Set up a domain in Office 365

      Revised by Israel Cenir Nature of Update Added a content, not just the video Date of Revision 28/10/2022 Before you begin To add, modify, or remove domains, you must be a Domain Name Administrator or Global Administrator of a business or enterprise ...
    • SMX - How to set up Inbound Scrubbing

      Revisions Revised by Mike Migalbio Nature of Update Confirmed this is still active process Date of Revision 25/10/2022 HOW TO:   How Inbound Scrubbing Works in SMX ENVIRONMENT SMX ​ PROCESS Inbound Scrubbing  There are six sub-tabs under Inbound ...