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As part of an Exchange 2003 to 2010 migration, we need to move many (> 1000) domain users from Outlook 2003/2007/2010 to OWA. Users will be instructed to access they're mailbox by OWA but also we need to prevent them to open Outlook. Solution I found till now are:

  1. Uninstall Outlook via GPO
  2. Prevent Outlook from start by using software restriction policy on filename

We would like to avoid Outlook uninstall. Software restriction GPO in quite weak (against renaming filename) and MD5 restriction in not an option because of the high number of executable versions around. Is there any Office specific GPO that would prevent Outlook to be executed? Any other suggestion? For example removing icons and links from start menu?

Thank you all for help.

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Are you really expecting many people to go and rename OUTLOOK.EXE so they they can run it? I would have thought a software restriction policy just covering the executable name would cover the vast majority of users. –  Chris McKeown Oct 6 '12 at 9:45
"For example removing icons and links from start menu?" - so you've saying you've got users who know enough to find and rename outlook.exe if you use SRPs, but who won't know enough to find outlook.exe and just run it if you remove their shortcuts? seriously? –  RobM Oct 6 '12 at 9:56
I'm just evaluating all the options. I agree that majority of users won't rename outlook.exe but nowadays anybody could google for a solution in minutes, no need of special knowledge –  Danilo Brambilla Oct 6 '12 at 11:12
To be clear, you're permanently moving users away from Outlook and to OWA, and this is not just during the migration period? –  sysadmin1138 Oct 6 '12 at 13:03
1. Uninstalling Outlook is not an option? Too bad because that's the best solution. 2. Software Restrictions using a hash rule is not an option because there are a high number of Outlook versions around? I can think of 6 versions of Microsoft Office. How many can you? Also, do you not know what versions of Outlook are installed in your environment? –  joeqwerty Oct 6 '12 at 13:55

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