Exchange Server 2016 Backup and Update

Hello Experts,

I have an Exchange server 2016 with Cumulative Update 5.  Do I install the Cumulative Update 6,7,8 and 9 in order or I can just install the Cumulative Update 9?  Also, I would like to create a backup of the Exchange database before applying the update.  Is it as simple as dismounting the database and making a copy?  Please advise.  Thanks.
Infotech2008Asked:
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timgreen7077Exchange EngineerCommented:
All cumulative updates contain the previous updates also, so no you don't have to install previous versions. you can just install the current version.

in regards to backups I would suggest using some backup software so that transaction logs can be cleaned up also. if you don't have a backup solution or 3rd party backup software, you can always use Windows Server Backup to backup the exchange database. just install that feature via the Server Manager.
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Infotech2008Author Commented:
Ok, so apply the latest Cumulative Update 9, correct?  I will use Windows Backup to create a one time backup for the purposes of update.  I do have a backup system.  Thanks.
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timgreen7077Exchange EngineerCommented:
oh ok if you already have a backup system then you don't need to use Windows backup, just use whatever you have.

Yes you can just install the latest update. be sure to review prerequisites for the update, because there may be new requirements. I know exchange 2016 cu9 will require .net framework 4.7.1, so that will have to be installed and setup prior to the install. other than reviewing preqs you can install the latest version.
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Infotech2008Author Commented:
One last related question, we are having Outlook 2010 on and off disconnect issue?  Will the Cumulative Update fix the disconnect problem?
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Hypercat (Deb)Commented:
Just an additional comment re: skipping cumulative updates for Exchange 2013-2016. I just happen to have read an article indicating that the CUs expire after a certain period of time, and if you get too far behind, it's possible that could create problems.  One of the issues mentioned is what timegreen777 said regarding prerequisites.  Here's a link to the article, which I think is good reading for anyone running Exchange 2013 or 2016:

https://practical365.com/exchange-server/fixing-outdate-cumulative-updates-net-framework/
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timgreen7077Exchange EngineerCommented:
No necessarily, that is a completely different issue, but there may be fixes in the CU9 for that issue. I can't say for sure. This could have been fixed in a previous CU so with CU9 being installed all previous fixes are included.
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Hypercat (Deb)Commented:
Sorry, timgreen777, I misspelled your name in my post above!
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timgreen7077Exchange EngineerCommented:
Author's question was answered. Initiating close and assigning points.
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