OWA 2007/IIS problem

Have a look in IIS Manager to see which is missing, the OWA VDir, or the Lang.owa file that's supposed to be in it.

The OWA directory is there.  I don't see lang.owa there, but it isn't there on a working Exch2007 server either, so I reckon that file is generated on the fly or something like that?

I was hoping not to have to reinstall Exch 2007 for something like this.  I've never tried it, but if I just install over the top will it maintain data and settings?  If the problem is IIS related I reckon it may not solve the problem anyway?
The OWA directory has quite a lot of stuff in it, is it just as simple as delete and create again?  Is it not linked to Exch 2007 in some way that will make this procedure kinda risky?

nop it is safe to reinstall the E12, but try to recreate the cirtual directory first

Excellent, removing and adding the owa directory worked perfectly!  Thanks guys!

Here are the commands I used from the Exchange Shell for future reference -

1.
Get-OwaVirtualDirectory
This gives a list of the OWA virtual directories, top one should be something like "owa (Default Web Site)".

2.
Remove-OwaVirtualDirectory -identity "owa (Default Web Site)"
Deletes the default "owa" directory.

3.
New-OWAVirtualDirectory -OWAVersion "Exchange2007" -Name "owa (Default Web Site)"
Create the "owa" directory again.

I get an error message when re-creating:

New-OwaVirtualDirectory: An error occured while creating the IIS virtual directory 'IIS://..../W3SVC/1/ROOT/owa' on '....'

What is wrong with my server?

You'll need to create a new question, this thread is buried now so nobody will see it and be able to help.

I had the same problem (posted by the original author) and put together these instructions from a combination of this post, other EE posts, and various microsoft articles.  Worked like  a charm for me.

1.      Open up the Exchange PowerShell command window.
2.      Run: Get-OwaVirtualDirectory

This will display a list of all OWA-related virtual directories under the Default Web Site.  Note that you may receive an error in red text on some or all of the virtual directories if they are not working properly (which is to be expected.)
3.      Run the following commands to delete each virtual directory:
Remove-OwaVirtualDirectory -identity "owa (Default Web Site)"

Repeat this step for each virtual directory found after running Get-OWAVirtualDirectory in step 1, replacing the owa (Default Web Site) with each virtual directory name.
Example:
Remove-OwaVirtualDirectory -identity "owa (Default Web Site)"
Remove-OwaVirtualDirectory -identity "Public (Default Web Site)"
Remove-OwaVirtualDirectory -identity "Exadmin (Default Web Site)"
Remove-OwaVirtualDirectory -identity "Exchweb (Default Web Site)"
4.      Run the following commands to re-create each OWA virtual directory:
New-OWAVirtualDirectory -OWAVersion "Exchange2007" -Name "owa (Default Web Site)"
new-OwaVirtualDirectory -OwaVersion "Exchange2003or2000" -VirtualDirectoryType "Mailboxes" -DomainController dc_name
new-OwaVirtualDirectory -OwaVersion "Exchange2003or2000" -VirtualDirectoryType "Exadmin" -DomainController dc_name
new-OwaVirtualDirectory -OwaVersion "Exchange2003or2000" -VirtualDirectoryType "PublicFolders" -DomainController dc_name
new-OwaVirtualDirectory -OwaVersion "Exchange2003or2000" -VirtualDirectoryType "exchweb" -DomainController dc_name

Where dc_name is the name of your windows domain controller.
Thats itthese virtual directories should be re-created, and OWA should function.

ANOTHER SOLUTION:
For some, it is impossible to recreate the directory OWA.
What I have done:
1. Uninstall Framework 1.1
2. Installing Framework 2
3. Add Hostfix Framework 2
4. Delete the role Access Client (CAS) server via the installation CD Exchange: Start, Run, cmd: go on the CD, type: setup.com / mode: uninstall / role: CA
5. Installing the new role: setup.com / role: CA
6. Everything is back in order