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Is .NET Framework essential to the operation of Exchange?

I am experiencing update failures with .NET, and would like to delete all versions from my server and start over, but I need to  know if .NET is integral to Exchange, in case there are issues with reinstalling.
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HilltownHealthCenter
Asked:
HilltownHealthCenter
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3 Solutions
 
Glen KnightCommented:
Absolutely!
All the application pools that are used for OWA etc use .net
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HilltownHealthCenterAuthor Commented:
OK. Well since I inadvertantly gave 500 pts to a yes/no question, perhaps I can get some advice on how to fix the underlying problem.

I get this error sequence each day:

Installation Ready: The following updates are downloaded and ready for installation. This computer is currently scheduled to install these updates on Tuesday, January 12, 2010 at 3:00 AM:
- Microsoft .NET Framework 3.5 Service Pack 1 and .NET Framework 3.5 Family Update for .NET versions 2.0 through 3.5 (KB951847) x86

Installation Failure: Windows failed to install the following update with error 0x80070643: Microsoft .NET Framework 3.5 Service Pack 1 and .NET Framework 3.5 Family Update for .NET versions 2.0 through 3.5 (KB951847) x86.

Attached is an image of the current .NET installation.
NET.JPG
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HilltownHealthCenterAuthor Commented:
The most critical issue is that the server will often hang on a reboot (i.e.after an autoupdate). The only log entries that are suspicious are above.
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Glen KnightCommented:
have you tried downloading the installation and running it manually?
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HilltownHealthCenterAuthor Commented:
I found 3.5 and tried to install it, but got a failure, which I did not record, but it would most likely do the same thing again...
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HilltownHealthCenterAuthor Commented:
I have the .net 3.0 installer (dotnetfx3.exe). I am considering uninstalling the current 3.0 sp2 and reinstalling. How risky is this?
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Jamie McKillopIT ManagerCommented:
Hello,

My recommendation would be to try installing 3.5 again manually but this time, capture the error message and post it. Also, post any relevant event log messages.

JJ
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NJComputerNetworksCommented:
http://blog.mpecsinc.ca/2007/07/windows-xp-net-update-installuninstall.html

I would suggest to turn of AV software during the install too...
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NJComputerNetworksCommented:
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HilltownHealthCenterAuthor Commented:
The specific fix (gleaned from the above links):

Download and run netfx_cleanup to remove older .NET versions (removed 2.0 and higher)
Reinstall 3.0 then 3.5.
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