06 February 2018

Exchange 2013 installing a CU, Schema update required or not?

Update 18-02-2019 - CU22 added & .NET 4.7.2. support for CU21 and CU22
Update 21-06-2018 - CU21 added & Visual C++ Redistributable Packages for Visual Studio 2013
Update 27-03-2018 - CU20 added
Update 06-02-2018 - CU19 added & .NET 4.7.1. requirement for up coming CU21
Update 03-10-2017 - Technet article quote added

From Technet:
Active Directory schema changes in Exchange 2013 cumulative updates CU8 and later

No changes have been made to the Active Directory schema in Exchange 2013 from CU8 onwards. The last cumulative update to include schema changes is currently Exchange 2013 CU7.https://technet.microsoft.com/en-us/library/bb738144(v=exchg.150).aspx

This is some of those things you need to check before updating an Exchange environment every time a new CU gets put out.

Do i need to do a Schema update or not?

I came across this post from Rhoderick Milne,

Table Of Exchange 2013 Schema Versions

Exchange Version
msExchProductId
rangeUpper
MESO objectVersion
Organisation objectVersion
Exchange 2013 RTM
15.00.0516.032
15137
13236
15449
Exchange 2013 CU1
15.00.0620.029
15254
13236
15614
Exchange 2013 CU2
15.00.0712.024
15281
13236
15688
Exchange 2013 CU3
15.00.0775.038
15283
13236
15763
Exchange 2013 SP1
15.00.0847.032
15292
13236
15844
Exchange 2013 CU5
15.00.0913.022
15300
13236
15870
Exchange 2013 CU6
15.00.0995.029
15303
13236
15965
Exchange 2013 CU7
15.00.1044.025
15312
13236
15965
Exchange 2013 CU8
15.00.1076.009
15312
13236
15965
Exchange 2013 CU9
15.00.1104.005
15312
13236
15965
Exchange 2013 CU10
15.00.1130.007
15312
13236
16130
Exchange 2013 CU11
15.00.1156.006
15312
13236
16130
Exchange 2013 CU12
15.00.1178.004
15312
13236
16130
Exchange 2013 CU13
15.00.1210.003
15312
13236
16130
Exchange 2013 CU14
15.00.1236.003
15312
13236
16130
Exchange 2013 CU15
15.00.1263.005
15312
13236
16130
Exchange 2013 CU16+.NET4.6.2
15.00.1293.002
15312
13236
16130
Exchange 2013 CU17
15.00.1320.004
15312
13236
16130
Exchange 2013 CU18
15.00.1347.002
15312
13236
16130
Exchange
2013 CU19
15.00.1365.001
15312
13236
16130
Exchange
2013 CU20
15.00.1367.003
15312
13236
16130
Exchange
2013 CU21 
+ .NET 4.7.1 + VC++2013
15.00.1395.004 
15312
13236
16130
Exchange 2013 CU22 + .NET 4.7.1 & .NET 4.7.2
15.00.1473.003
15312
13236
16131
TechNet documents the expected values for the various Exchange 2013 objects in AD.

Check back here when a new CU is released.

Another top tip from Rhoderick is to install .net 4.6.1 after installing the CU and having the machine rebooted.
At this moment .NET 4.7 is being skipped altogether.

From CU21 .NET 4.7.1 and VC++2013 are required 

After installing CU19 .NET 4.7.1. is supported not required.
After installing CU21 .NET 4.7.2. is supported not required.
After installing CU22 .NET 4.7.2. is supported not required.

How to prepareAD from a member server:
https://technet.microsoft.com/en-us/library/bb125224(v=exchg.150).aspx#Anchor_2

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