Error when trying to Enable Exchange Certificate


Well first I want to give some background for my problem:

I'm setting up a solution with 2 normal AD domains and 1 resource domain. The resource domain has the Exhcange 2007 server and I'm using linked mailboxes so the users in the 2 normal AD's has access to there mailboxes.

Everything works fine except that I recieve following error: 0X8004010F in the sync log at my Outlook 2007 client. This error has something to do with the OAB i think?!

Anyway... This error is showing a warning to the users and we can't have it like this....

I read an article about this problem. The article wanted me to create a certifiacte and distribute it with GPO. There's already a certficate in use for the OWA and ActiveSync (pushmail) that's up and running.

When i create a certifcate like the article says using the "New-ExchangeCertificate" and "Import-ExchangeCertificate" functions in PowerShell. Everything goes ok, and I'm getting the "Thumbprint".

So over to the problem:
When I'm trying to run the "Enable-ExchangeCertificate" i get the following error:

Enable-ExchangeCertificate 488AA83E971CF81724077B4B4D2D2858A4BED749 -Services IIS
Enable-ExchangeCertificate : The certificate with thumbprint 488AA83E971CF81724
077B4B4D2D2858A4BED749 was found but is not valid for use with Exchange Server
(reason: PkixKpServerAuthNotFoundInEnhancedKeyUsage).
At line:1 char:27
+ Enable-ExchangeCertificate  <<<< 488AA83E971CF81724077B4B4D2D2858A4BED749 -Services IIS

This was a lot of infomation..... Hopefully this is enough for you to understand my problem ;)
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