Microsoft Exchange Server Issue : Outlook Email

[gohalo3]

All,

I need some HUGE help.

A couple of weeks ago I was able to successfully download my work email through our Microsoft exchange server domain and server information (for months it was working). As of right now, I am now getting errors:

Security certificate on the server is not valid. Contact your exchange server admin or ISP to install a valid certificate on the server.
Support Code: 80072f0d

I have deleted partnership with my computer and re-partnered, deleted my email account and add it back again... All was unsuccessful... does anyone have the idea why this suddenly occured after months of working great. How do i get it to work again.

Please let me know. Thanks!