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    We have 2 sites, 4 CAS servers and 6 MB server at each site. We are preparing to upgrade from CU9 to CU14. We will be upgrading one site at a time, but within the same site, how critical is it to get all the servers done the same night?

    If 1/2 the server get upgraded to CU 14, is it acceptable for the rest of them to be running CU9 for a day or two?

    Tom

    Tuesday, November 22, 2016 10:00 PM

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    Thanks for your information and sorry for later response.

    You wouldn't experience any adverse effects on the other two servers in site B, the same as site A.

    Regards,

    Jason Chao

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

    • Edited by Jason.Chao Wednesday, December 21, 2016 8:43 AM
    • Marked as answer by Tom_Slycke Thursday, January 5, 2017 9:37 PM
    Wednesday, December 21, 2016 8:43 AM

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    Since you have redundant CAS & MBX  servers on each sites you can plan for the upgrade one by one servers

    From Exchange 2013 Microsoft recommends to upgrade the mailbox server first and then the cas server

    Upgrade each mailbox server one by one by moving the active copies to the other nodes 

    THere is a good article from Paul which you can follow http://exchangeserverpro.com/exchange-2013-installing-cumulative-updates/

    Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts on http://exchangequery.com Thanks Sathish (MVP)

    • Proposed as answer by Jason.Chao Thursday, November 24, 2016 8:46 AM
    Wednesday, November 23, 2016 5:21 AM
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    Hi,

    Agree with Sathish. We need to put the servers in maintenance mode before updating each one. Upgrade the MBX servers first:

    Please refer to: Script: putting Exchange Server 2013 into Maintenance Mode

    Please note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information. And the changes made in the above blog is not supported officially by Microsoft.

    Hope it helps.

    Regards,

    Jason Chao

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

    • Proposed as answer by Jason.Chao Tuesday, November 29, 2016 5:12 AM
    Thursday, November 24, 2016 8:53 AM
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    Let me see if I can verbalize my question better.

    Site A: 4 CAS 6 MB servers

    Site B: 4 CAS, 6 MB servers

    I will be upgrading Site B first, if I would happen to get 3 or 4 of the mailbox servers upgraded, and los my maintenance window, or need to stop further upgrades for any various (non-exchange related) reason, would we experience adverse effects from running in SiteB with 2 MB servers at CU9 and 4 MB servers at CU14?

    Other questions would apply that ti Site level. If I get SiteB completely upgraded to CU14, would there be problems with upgrading SiteA the following weekend, having the two sites on divers CU level for a week?

    Tom

    Thursday, December 15, 2016 4:17 PM
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    Thanks for your information and sorry for later response.

    You wouldn't experience any adverse effects on the other two servers in site B, the same as site A.

    Regards,

    Jason Chao

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

    • Edited by Jason.Chao Wednesday, December 21, 2016 8:43 AM
    • Marked as answer by Tom_Slycke Thursday, January 5, 2017 9:37 PM
    Wednesday, December 21, 2016 8:43 AM