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Microsoft Exchange 2003 Standard In-place Upgrade to Enterprise Problem

I have attempted an inplace upgrade of Microsoft Exchange 2003 Standard to Enterprise by following the instructions at http://support.microsoft.com/?id=170280.  After running the "reinstall" option and reapplying the patches that were installed, Exchange System Manager still reports "Standard" and I am unable to create any additional mailbox stores, as I receive the message "This storage group already contains the maximum number of stores allowed."  The upgrade instructions seem pretty simple, and I believe I have performed all the steps as instructed, so I need some help in figuring out what I've overlooked!  Thank you very much!!
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fishadr
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How many stores do you have, in Exchange 2003 Enterprise you can only have 4 stored plus wiht Recovery Storage Group. Some times it can take a while to update the display to show the Enterprise version.
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The server is currently reporting "Standard" version and I only have one private store currently.

Thanks for the link!  I checked all three "methods" and found these results:
Method 1: (Event Log) indicates Standard
Method 2: (Uninstall Registry) neither the Standard OR Enterprise keys exist!...
Method 3: (Examine the Type attribute) event 1112 does not exist in my Application Log

What is your opionion on this:  On July 4, I ran the "reinstall" from the Enterprise CD and then applied SP2.  It was not until a week later that I installed the patches that were installed previously (more of a dumb mistake on my part).  I did not think this would fail the upgrade (but maybe that was wrong) as with each patch install, it stops and then restarts the Exchange services.  Inbetween the time I ran the reinstall + SP2 install and then later the patches, I had checked the article above.  In the "Uninstall" section of the registry, it showed both keys - Standard and Enterprise - now it's showing nothing.

Thanks again for your help!
Once Exchange has been upgraded to Enterprise edition it cannot be downgraded. It would seem that the upgrade has therefore not worked.

Once the upgrade has been applied all service packs and hotfixes should be applied to ensure everything is secure and stable.

I have run the upgrade quite a few times and not had any issues. Can you check the software CD you are using to ensure it has Enterprise on it and not the standard version? I would then re-run the process and check the logs for any errors, make sure you have are logged in tot he server with full Exchange Admin rights - as previously stated, it is very straight forward process and does not normally go wrong.
It may also be worth looking at what patches you are applying prior to installing them, it does not normally cause any issues but if you install the patch to upgrade the database limit on Exchange 2003 this can cause the system to think it has a limit installed and can be misleading.

Do the upgrade and install SP2 then run all the checks, identify which hotfixes you are going to apply (and that they are relevant) then apply and check again
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I used the install media that I downloaded from my eOpen account.  I believe I've obtained the correct download, but I'm going to redownload and verify.  I'll have to run the "Reinstall" again and this time follow the directions correctly (applying the SP and patches at the same time).  I'll have to schedule a time to do this so time will tell.  Thanks for the input fishadr!
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Thanks very much.  I'm still working on scheduling some time to rerun the process, but this definitly gives me the direction I needed.  Thanks!