Consider the following scenario:
- You have user mailboxes that are hosted in Exchange Online in Office 365.
- You use Microsoft Exchange Hosted Archive (EHA).
- You are transitioning from EHA to Exchange Online by moving your EHA archives.
- Transport forwarding rules (rules that are set up in the Exchange Admin Center or Exchange Control Panel) are enabled on the Exchange Online mailboxes.
In this scenario, archived messages may be unexpectedly forwarded to the current forwarding address. For example, messages that were archived years ago may be sent to the current forwarding address of the Exchange Online mailbox.
When EHA email data is migrated to Exchange Online, the data is migrated by Simple Mail Transfer Protocol (SMTP) transport. If transport forwarding rules are enabled in Exchange Online, this triggers forwarding actions in the migrated EHA messages.
To check whether transport forwarding rules are enabled in Exchange Online, do one of the following in Outlook Web App:
- In Office 365, click Settings (
), click Options, and then click Forward your e-mail.
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- In Office 365 pre-upgrade, click Options, click See All Options, and then click Forward your e-mail.
We recommend that you convert your transport forwarding rules to Outlook inbox forwarding rules (client-side rules) during migration from EHA to Exchange Online. After the migration is complete, you can revert the Outlook rules back to transport rules.
We have created two Exchange Online PowerShell scripts to make this process easier:
- Customer_BackUpAndDeleteTransportForwardingRules.ps1: This script exports all transport forwarding rules to two .csv files, and then it creates similar Outlook rules. After that, it removes the transport rules.
- Customer_RestoreTransportForwardingRules.ps1: This script uses the two .csv files that were generated in the previous script to re-create your transport rules and to remove the Outlook rules.
For help in obtaining and running these scripts, contact EHA technical support. To do this, click Get Help Now
in the Forefront Online Protection for Exchange (FOPE)/EHA Admin Center, or call 1 (866) 291-7726. To run these scripts, you must be an Office 365 admin who can open a remote PowerShell session in Exchange Online.
Still need help? Go to the Office 365 Community
Article ID: 2841616 - Last Review: September 3, 2013 - Revision: 5.0
- Microsoft Office 365 for enterprises (pre-upgrade)
- Microsoft Office 365 for education (pre-upgrade)
- Microsoft Exchange Online
- Microsoft Exchange Online Protection
- Microsoft Exchange Hosted Archive
- Microsoft Forefront Online Protection for Exchange
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