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Installing Exchange 2013 CU19 on Exchange 2013 CU13 RRS feed

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    Hi all,

    We have a 2 node Multirole (Mailbox/CAS) Exchange Infrastructure which is configured in DAG. The Servers are both running Windows Server 2012 R2.

    Both these servers are running .NET Framework version 4.5.2 (Release 379893)

    Currently, it is running Exchange Server 2013 CU 13

    I am looking to install the latest Cumulative update (CU 19, which is the latest as of now)

    While I was going through the release notes, I understand that .NET 4.6.2 is required now to install CU 19.

    In the release notes for Exchange Server 2013 Cumulative Update 16 it says that "Customers who are still running .Net 4.5.2 should deploy Cumulative Update 4 or Cumulative Update 15, upgrade the server to .Net 4.6.2 and then deploy either Cumulative Update 5 or Cumulative Update 16."

    I have also gone through one of the blogs here. 

    So, does this mean that I must first deploy CU 15, Upgrade .NET Framework, then install CU 19?

    If that is the way it should be done, could someone please help me get the link to download CU15? Because when I go to the KB Article for CU15, it says "This update is no longer available because CU 18 was released"

    Can I use CU 18 as that intermediate step? 

    Based on CU15 / CU18, the path that I should take is

    1. Update Internet facing Mailbox server to CU15/18
    2. Update the next Exchange Server to CU15/18
    3. Confirm that everything is good
    4. Update .NET Framework to 4.6.2 on both the servers
    5. Update Internet facing Mailbox Server to CU19
    6. Update the next Exchange Server to CU19
    7. Update .NET Framework to 4.7.1

    Please correct me if I am wrong. Also, please clarify which CU should I use at the intermediate step. Link to download CU15 (if it is CU15)

    Thanks in advance.

    Thursday, December 28, 2017 4:08 AM

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    Hi,

    As you said, the download link of Exchange 2013 CU15 is unavailable right now, but it is necessary to upgrade to Exchange 2013 CU15 firstly, because the version prior to CU15 is not supported with .Net Framework 4.6.2.

    I recommend you to contact Microsoft for the assistance. 

    Global Customer Service phone numbers

    Thanks for your understandings.

    Regards,

    Manu Meng

    Please remember to mark the replies as answers if they helped.
    If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    • Marked as answer by Tom - Tuesday, January 2, 2018 10:03 PM
    Friday, December 29, 2017 3:17 AM

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    Hi,

    As you said, the download link of Exchange 2013 CU15 is unavailable right now, but it is necessary to upgrade to Exchange 2013 CU15 firstly, because the version prior to CU15 is not supported with .Net Framework 4.6.2.

    I recommend you to contact Microsoft for the assistance. 

    Global Customer Service phone numbers

    Thanks for your understandings.

    Regards,

    Manu Meng

    Please remember to mark the replies as answers if they helped.
    If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    • Marked as answer by Tom - Tuesday, January 2, 2018 10:03 PM
    Friday, December 29, 2017 3:17 AM
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    Hi Manu Meng,

    Thanks for the clarification. I will try to contact Microsoft regarding this and get the CU15 download location.

    Tuesday, January 2, 2018 10:03 PM
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    Did you get anywhere with this, we are in exactly the same boat running CU13 wanting to upgrade to CU19.

    How did you get on?

    Tuesday, February 13, 2018 9:58 AM
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    Hi Guys,

    Facing the same problem? cannot find anymore CU15.

    Any update on your side?

    Thanks

    Thursday, February 15, 2018 8:40 AM
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    Have a look here, comments section. Article author shared CU15 via his onedrive.

    https://justaucguy.wordpress.com/2017/07/03/a-bridge-too-far-exchange-2013-cu15/

    Thursday, February 15, 2018 12:27 PM
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    I read that since CU17 you do not need to go to CU15 first. Put exchange in maintenance
    mode, update .net to 4.6.2 and then update to CU19.

    However according to the install notes for exchange you still need to, can anyone confirm?

    https://technet.microsoft.com/library/bb691354(v=exchg.150).aspx

    "Exchange 2013 CU16 and later require .NET Framework
    4.6.2. Upgrade your servers to .NET Framework 4.6.2 before you install
    Exchange 2013 CU16 or you'll receive an error. If .NET Framework 4.5.2
    is installed on your Exchange servers, upgrade your servers to Exchange
    2013 CU15 before installing .NET Framework 4.6.2."
       

    In fact, I have just checked our .net version and both exchange servers are running .net 4.7.1 which it must have picked up via windows update. Both servers are currently only running CU13, we have not come across any issues running them with .net 4.7.1

    Would the recommendation be roll back to 4.5.2 install CU15, upgrade to 4.6.2, install CU19 and then upgrade 4.7.1 or should I be fine going straight to CU19 from CU13???




    • Edited by Bristow2013 Thursday, February 15, 2018 12:48 PM
    Thursday, February 15, 2018 12:28 PM
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    I have the same setup:

    Exchange 2013 CU13 

    .NET version on server is 4.7.02558 (Release from registry entry 461310)

    Need to get up to CU19

    Please advise if this changes the process of first installing CU15, then install CU19.

    Thank you.

    Thursday, February 15, 2018 7:04 PM