Hybrid Users & Exchange

The hybrid conundrum. You’ve got a user happily residing in the Microsoft 365 cloud, mailbox baking away in Exchange Online. All gravey, right? And you find its not! Emails from on-prem buddies and apps aren’t baking like a bad batter mix.

Fear not, fellow IT baker! I’ve got a fix. Just a bit of PowerShell: life has been restored, emails flowing like a perfect batter mix.

Forget manual attribute tweaks, that’s old-school. This script is fast, automated, and easy to use!

What does it do?

• Gathers the necessary info about your hybrid user (both User and Shared Mailboxes are welcome!)
• Updates crucial attributes in Active Directory so it sings in perfect harmony with Exchange Online
• Opens the email floodgates, letting those on-prem messages waltz right in like long-lost friends

What does it update?

• It enables the user locally as a “New-RemoteMailbox”,
• then sets GUID (matched from MS365).

Ready to wave goodbye to email woes?

Microsoft 365 Remote Mailbox Fix Script, a PowerShell script that automates remote mailbox creation in a hybrid Exchange environment.

## Functionality:

• Streamlined remote mailbox creation: Simplifies manual configuration, reducing errors and saving time.
• User and shared mailbox support: Handles both standard user mailboxes and shared mailboxes seamlessly.
• GUID matching: Ensures consistency between on-premises and Microsoft 365 mailboxes for accurate synchronization.
• Detailed logging: Provides a history of script execution and potential issues for troubleshooting purposes.
• Input validation: Prevents errors by verifying user input before proceeding with mailbox creation.
• Module dependency check: Confirms the necessary PowerShell modules are installed before execution.

## Usage Guide:

1. Prerequisites:

• Install the Exchange Online Management module: Install-Module -Name ExchangeOnlineManagement
• Ensure sufficient permissions to connect to both Microsoft 365 and on-premises Exchange.

2. Script Execution:

• Save the script to your PC.
• Run the script: .\Microsoft365RemoteMailboxFix.ps1

3. User Input:

• Exchange Server FQDN: Fully qualified domain name of your on-premises Exchange server.
• Remote Routing Domain: The routing domain associated with your Microsoft 365 tenant.
• Microsoft 365 UPN: User Principal Name of the user in Microsoft 365.
• Active Directory User Account UPN: User Principal Name of the user account in Active Directory.
• Shared Mailbox (yes/no): Specify whether the mailbox is for a single user or a shared mailbox.

4. Logging and Output:

• The script creates a log file (%windir%\Temp\Logs\Microsoft365RemoteMailboxFix.log) containing detailed information about its execution, including any errors or warnings.
• The script also outputs progress messages to the console during execution.

## Additional Notes:

• Test the script in a non-production environment before using it in a production environment.
• Review the script code for details and customization options.
• Contribute to the script’s improvement by raising issues or suggesting enhancements on the GitHub repository.

Download Here: wsherwen/Microsoft365HybridUserFix: Fix users that Hybrid Exchange is unaware of. (github.com)