I recently installed Yosemite on my iMac and besides the myriad of other glitches, my primary concern is that my Outlook for Mac is now showing the message "Unable to establish a secure connection to the server because the correct root certificate is not installed." I've deleted all email accounts and added them again (twice). Checked that nothing has changed with Verizon and other account's server information. Anyone have a fix for this? I work from home and it's having a huge impact on my business.