I have a Single mail server with Zimbra 8.0.0 for generate certificate I'm following

1. Generate the cert.

   ORG=MyOrganization
   CN=mail.mydomain.com
   COUNTRY=myCountry
   CITY=myCity
   
   /opt/zimbra/bin/zmcertmgr createcrt -new -days 365 -subject "/C=$COUNTRY/ST=N/A/L=$CITY/O=$ORG/OU=ZCS/CN=$CN"    
   /opt/zimbra/bin/zmcertmgr deploycrt self -allserver
   su - zimbra "zmcontrol restart"
   

2. Veririficate with /opt/zimbra/bin/zmcertmgr viewdeployedcrt. i can see the new cert

3. In Chrome go to https://mail.mydomain.com and export the .cer test in a Windows client

   certutil.exe -addstore root \path\to\exported.cert
   root "Root Certification Authorities trusted"
   You can add a root certificate to the root store
   CertUtil:-addstore command error: 0x8007000d (WIN32: 13)
   CertUtil: Invalid data.
   

even from chrome i've tried to add the cert without successful results.

can anyone help me with this problem?