Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm trying to renew our exchange 2010 certificate. I have followed this guide. When I try to open the .req file it is in binary.

Is there a way to convert it to text so I can continue with the guide?

share|improve this question
Do you plan on using an internal CA, or do you need to enroll your request with a public CA (like VeriSign, Comodo, GoDaddy, etc.?) – Mathias R. Jessen Sep 23 '12 at 13:08
Hi, I plan to use an Internal CA on another server rather than self certificate or use VeriSign etc. Thank you for the solution below, I will try this later. – Matt Sep 24 '12 at 9:05
up vote 2 down vote accepted

I've seen this in the GUI (the Exchange Management Console) before.

To resolve this, I used the Exchange Management Shell instead:

First, find the thumbprint of the certificate you are about to renew, by issuing:


Copy the Thumbprint and generate a CSR by piping it to the New-ExchangeCertificate cmdlet:

Get-ExchangeCertificate -Thumbprint "The Thumbprint goes here" | New-ExchangeCertificate -GenerateRequest -KeySize 2048 -PrivateKeyExportable:$true
share|improve this answer
Hi. This was helpful, but when I created a new certificate and renewed the certificate, the Expiration date was the same. Do you have any suggestions. Thank you. – Matt Sep 25 '12 at 7:51
Have you tried to open the Certificates MMC, and simply right-click the certificate and choose "Renew with new key". It should let you choose a domain CA to enroll your request with, right away – Mathias R. Jessen Sep 25 '12 at 20:07
I have done this, The main CA needed updating also. Thank you for your help. – Matt Sep 26 '12 at 9:22

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.