SyTrust offers you products which can solve your problems - no matter which PKI you are using.
Amongst other things you can check here whether your browser verifies if a certificate is valid (revoked certificate).

• You are not able to verify the validity of a certificate resp. a TrustCenter coming from another company and vice versa?
   
• You applications can't process you certificates? Each application has different critera by which they verify certificates?
   
• You are not able to revoke certificates fast enough? There are always problems with the revoked verification in the applications?
  
  
• Your employee lost his smart card, now he is not able to use his digital signature for several days? He will not have acess to his encrypted documents? 
   
• You do not want to supply every employee with an expensive smart card? You have difficulties with a fast/silmutaneous supply of smart cards for all work-places?
  
  
• Your employees have no access to old encrypted documents? To retrieve such encrypted documets is organisational sumptuous and therfore solved unsatisfactory? 
  
  
• You can't retrieve documents which belong to former-employees? You feel the  organisational input in such cases is to high?