Certificate Error when setting up Outlook Client

A client of ours was running an in-house Exchange server and decided to move to Office 365... To facilitate the cutover migration, we needed to install a temporary SSL certificate on the server which we bought for a period of three months. We have completed the migration and all of the mailboxes are in the cloud. 

BUT, the certificate has just expired, and when I needed to connect a new Outlook 2013 client to the Office 365 account it comes up with an error saying that the certificate has expired... I've tried to manually set up the account also, but it wont accept the ExchangeID I get when I connect to powershell and run the Get-Mailbox command. It says the server does not exist. 

What is crazy is that if I set up Outlook with very same account from my site (as a test), which has no SSL cert at all, it connects seamlessly. Can anybody give me advice on what approach I might take to resolving this? 


February 18th, 2015 6:50pm

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