To Configure Personal Sign Certificate issued by Global-sign in Microsoft Outlook Express please follow the given below links

https://support.globalsign.com/customer/portal/articles/1214839-installing-your-personalsign-certificate---microsoft-outlook-2007

https://support.globalsign.com/customer/portal/articles/1214979-using-your-personalsign-certificate---microsoft-outlook-express

***Note : please note that if the hash algorithm of the certificate is SHA256, then make sure that the client system should be Windows XP SP3 onward or it is recommended that the client system should be running on Windows 7. For confirmation please visit the link below

https://support.globalsign.com/customer/portal/articles/1499561-sha-256-compatibility