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Error Re-installing CAS in Exchange 2010

I have uninstalled CAS in exchange 2010 to resolve an issue i am having with OWA, the uninstall went fine but when i go to reinstall through control panel / program / program features i get an error and it fails. I have also tried from the DVD and from a fresh download of Exchange 2010 SP1 from Microsoft.

Below is the error.

Summary: 6 item(s). 2 succeeded, 1 failed.
Elapsed time: 00:00:22

Preparing Setup

Elapsed Time: 00:00:00

Stopping Services

Elapsed Time: 00:00:16

Copy Exchange Files

Installing product D:\CMPNENTS\EXCHANGE14_SP1\exchangeserver.msi failed. Fatal error during installation. Error code is 1603.

Fatal error during installation
Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=

Elapsed Time: 00:00:05

Restoring services

Client Access Role

Finalizing Setup

I have read a lot of posts and they are for 2007 and say to reinstall with the lastest server pack but SP1 is the latest for Exchange 2010.

ExchangeSBSWindows Server 2008

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Last Comment

8/22/2022 - Mon
Seelan Naidoo

did you format and reinstall the box (fresh install) or have you just uninstalled Exchange Cas Role and you now trying to readd it..

If its the latter, it could be a number of things, references in registry still exist, try deleting/renaming the ExchangeSetup logs and reattempt..

Try with following steps:

1. Uninstall IIS components and reboot the server
2. Rename Inetpub folder and also check Inetsrv in C:\Windows\Inetsrv, please rename this as well.
3. Reinstall IIS components and reboot the server. Make sure both inetpub and inetsrv folders are re-created.
4. Start re-installing Exchange server.

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i took me ages to figure this one out but removing all the updates and trying again fixed the issue.

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