the security certificate has expired or invalid

on all my network computers, we get this windows "the security certificate on remote has expired or invalid"
only when we open MS outlook,

thank you
abbmcAsked:
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akhalighiCommented:
This means that your exchange self-signed certificate is expired . whar is the version of your exchange server ? if it's 2010 you should be able to see more details through EMC . just click on server configuration.
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akhalighiCommented:
So basically you need to renew your exchange self-signed certificate : here is an article about it :
http://msexchangegeek.com/2009/04/24/how-to-renew-a-self-signed-certificate-in-exchange-server-2007/
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abbmcAuthor Commented:
but i didn't work , every time typing the Get-ExchangeCertificate : FL . it says that the paramter not found or any with the : New-ExchangeCertificate it says a paramter not found
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akhalighiCommented:
what is the version of exchange and service pack ?
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akhalighiCommented:
it is :  Get-ExchangeCertificate |FL  

There is no ":" , its "|" before FL.
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abbmcAuthor Commented:
yes. i did renew the certificate with the PS.
but now , it says that this certificate root not trusteed.

Microsoft windows server 2008 standard and MS Exchange 2008.
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Andres PeralesCommented:
You may have to download the root chain, and the certificates chain and install on your machines.
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abbmcAuthor Commented:
it fixed
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