Can Outlook on Work-Group Machine connect to Exchange without trusting Certificate?? Share on Facebook Post on reddit Tweet on Twitter Share on LinkedIn Home › Forums › Messaging Software › Exchange 2007 / 2010 / 2013 › Can Outlook on Work-Group Machine connect to Exchange without trusting Certificate?? This topic has 3 replies, 4 voices, and was last updated 9 years, 3 months ago by FischFra. Viewing 1 post (of 1 total) Author Posts EngHanyMember Sep 06, 2011 at 3:22 pm #156098 Hello everyone, That’s my first Post here. I’ve misunderstanding here about Outlook secured Connection with Exchange 2010 sp1. We have some workgroup clients Windows XP and Windows 7 with mixed Outlook versions 2007 and 2010. The point is: These work-group clients don’t have the Exchange Certificate in there trusted CA store, Why they can connect to Exchange by MAPI connection?!! Outlook should check the certificate that will secure the connection. If it’s not trusted, Outlook should drop the connection with “cannot find …” message. User just have a little mismatch warning with CAS-Array FQDN certificate. when they click yes and give credentials, they connect and get mails. My manager consider this a security breach. Sorry, I’m pretty sure that They shouldn’t connect. Alot of research came to nothing about this. Could you clarify this point if I’m missing something? Thanks Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.