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Error: "The certificate is invalid for Exchange Server usage" using Microsoft Exchange 2010 server

Problem

The certificate is invalid for Exchange Server usage.

Cause

This error may occur on Microsoft Exchange 2010 server, if the following conditions are true:

     • Missing RapidSSL Intermediate CA

Solution

To resolve this issue with Microsoft Exchange 2010 server, perform the following steps:

Step 1: Obtain the RapidSSL Intermediate CA

  1. Download RapidSSL Intermediate CA
     

Step 2: Adding the Certificates Snap-in to the Microsoft Management Console (MMC):

  1. From the Web server, click Start
  2. In the Search programs and files field, type mmc
  3. From the Programs list, click mmc.exe
  4. At the permission prompt, click Yes
  5. From the Microsoft Management Console (MMC), click  File > Add/Remove Snap-in
  6. From the list of snap-ins, select Certificates
  7. Click Add
  8. Select Computer Account
  9. Click Next
  10. Select Local Computer (the computer this console is running on)
  11. Click Finish
  12. In the Add/Remove Snap-in window, click OK
  13. Save these console settings for future use


Step 3: Install the RapidSSL Intermediate CA

  1. Using the same Console, double-click on Intermediate Certification Authorities from the right pane
  2. Right-click on Certificates from the right pane and select All Tasks > Import to open the Certificate Import Wizard
  3. Click Next
  4. Specify the location of the RapidSSL Intermediate file obtained from Step 1 by clicking Browse
  5. Click Next
  6. By default, it will place the certificate in the Intermediate Certification Authorities store. Keep this selection and click Next.
  7. Click Finish
  8. A message will appear confirming the successful import of the certificate. Click OK
  9. Close the MMC console
     

Step 4: Assign the SSL certificate to Exchange Server 2010 Services

  1.  Launch the Exchange Management Console
  2. Navigate to Server Management, and select the server that has the certificate installed
  3. Right click the SSL certificate you wish to assign and choose Assign Services to Certificate
  4. Click Next to continue the wizard
  5. Choose the services you wish to assign to the certificate (e.g., Internet Message Access Protocol, Post Office Protocol, Simple Mail Transfer Protocol, Internet Information Services and Unified Messaging) and click Next
  6. Click Assign to execute the change
  7. When task has completed successfully, click Finish to close the wizard
     

Step 5: Verify certificate installation

To verify if your certificate is installed correctly, use the Installation Checker