exchange 2007, roll ups

We have following installed .

A)Update Rollup 15 for 2 CAS and 2 mailbox servers.
 Current version: 08.03.0389.002

we need to go for
Update Rollup 19 for 2 CAS and 2 mailbox servers.
Updated version: 08.03.0459.000


please let me know the steps, do we need to put the server in maintainance mode or just install the roll ups.
pramod1Asked:
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FOXActive Directory/Exchange EngineerCommented:
Yes, Best practice>> start with your CAS server.  

ref link: ref link:  https://technet.microsoft.com/en-us/library/ee221147(v=exchg.80).aspx
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FOXActive Directory/Exchange EngineerCommented:
Exchange 2007 does not use DAG configuration so applying maintenance mode when updating doesn't apply here.  A good read for your scenario is below.  

ref link:  https://technet.microsoft.com/en-us/library/ee221147(v=exchg.80).aspx
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MAS (MVE)EE Solution GuideCommented:
Plan a weekend for the update.
You dont need to put in maintenance mode for RU update.

Please check this for update of clustered mailbox servers

Install RU on passive nodes first then make passive as active and install on the other.

https://technet.microsoft.com/en-us/library/bb885043.aspx
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pramod1Author Commented:
we don't have clustering , each server is installed on VM.

please outline the steps to roll up to 19 from roll up 15
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pramod1Author Commented:
I have 6 different sites, each are having cas and hub server ,is it required for roll up to be installed at same time and I believe server doesn't need reboot
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MAS (MVE)EE Solution GuideCommented:
You can start with passive servers (passive first) then install on MBX servers. It is a straight forward process.

Thanks
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pramod1Author Commented:
as I told you I don't have clustering, can I install roll up on each server one by one
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suriyaehnopCommented:
You you start with CAS > Hub > Mbx

Your account used to update must be member of schema master as well since it will upgrade the AD schema

For mbx, if you run on CCR, please do on passive node then failover, then do on another node
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MAS (MVE)EE Solution GuideCommented:
You can install CAS/HUB first then install MBX servers
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