Issues updating Exchange 2007 to latest CU

I'm currently starting a project to migrate a customer's Exchange server from 2007 to 2013.

Part of the process (according to my understanding at last) is to bring the 2007 server fully up to date (that would be SP3 cu 17 I believe). The server build is currently 08.03.0083.000 which I believe to be SP3 without any CU installed.

However whenever I try to apply a cu (I started with 17 as I understand it doesn't need any further cu, but same issue with cu1) I get an error to the effect that the patch could not be installed because the program to be updated is not installed (see below - it's a French server...):

Screenshot-2015-09-23-20.24.59.jpg
Not sure what my next step should be from here ?

Suggestions most welcome
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Alexandre TakacsCTOAsked:
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Amit KumarCommented:
The server build is currently 08.03.0083.000

Are you sure about it, what I found the correct build for Exchange 2007 SP3 is 8.3.083.6. Please refer this article
Alexandre TakacsCTOAuthor Commented:
Running linked script I get:

MYSERVER,No Rollup Updates are installed,,08.03.0083.006

What's next ?!
jrhelgesonCommented:
Re-install SP3, then do the CU17
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Alexandre TakacsCTOAuthor Commented:
Thanks

Tried to re-apply SP3 but it does not let me - it apparently "sees" it as already installed (not the grayed out options):

SP3 Install dialog
Is there a way to "force" it ?
jrhelgesonCommented:
You need to re-run the install from the command line:
SETUP.COM /mode:install /ROLES:HT,CA,MB,MT

Prior to this, I'd also re-run the ADPrep components, because it can't hurt.
SETUP.com /PS && SETUP.com /P && SETUP.com /PD

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Alexandre TakacsCTOAuthor Commented:
THAT did the trick (SETUP.COM /mode:install /ROLES:HT,CA,MB,MT) !

Thanks ! And CU is now installing fine !
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