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Exchange 2013 CU6 to CU7

I have exchange2013 cu6 running on server 2012r2 with the latest patches on all. Internal and external DNS (split DNS) and all features are finally working correctly. It's not in production yet as testing was just completed. I just wanted to confirm that installing CU7 will leave all the settings in place.
Or will I have to redo some settings?
The CU6 will of course be backed up first.
Thanks
Harry
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HWC003
Asked:
HWC003
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3 Solutions
 
Imran KhanCommented:
As far as I know Exchange, the Exchange settings are stored in AD, upgrading the Exchange CU level will not effect any settings. Still is not a bad idea to backup the settings just in case.
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HWC003Author Commented:
After more research it is true the most settings are stored in AD. I finally found this from Microsoft "Exchange XML application configuration files are overwritten during cumulative update installation"  followed by some instructions on saving / restoring scripts. Since scripts presented a problem after the CU6 update. I'll leave things alone at CU6 . reviewing the fixes in CU7 shows nothing that would affect my installation.
Thanks
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HWC003Author Commented:
Was convinced to go to CU7. Yes it did overwrite all the settings for virtual directories. It also did something to security settings for all email accounts. Outlook, OWA, etc. wouldn't connect, since this server was in testing, I deleted accounts and recreated which fixed security problems.
 Not exactly related but CU7 requires upgrade to .NET 4.5.2  which I did first then CU7 wouldn't install because of locked files. An upgrade to .NET causes .NET to recompile (in background)  everything using .NET. The fix wait until service for .NET optimizer shows 0%cpu usage which may take several hours. Then install CU7
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