When patching Exchange 2013 or Exchange 2016 from an old Cumulative Update version, it is common to need to hop through multiple versions of Exchange Server.
For example, if your on Exchange CU11... to remain in a supported state you will need to patch as follows:
https://docs.microsoft.com/en-us/exchange/plan-and-deploy/supportability-matrix?view=exchserver-2019
For example, if your on Exchange CU11... to remain in a supported state you will need to patch as follows:
- Upgrade Exchange 2013
from CU11 to CU15.
- Upgrade the .NET
Framework to 4.6.2
- Upgrade from Exchange
2013 CU15 à
CU20
- Upgrade .NET Framework
to 4.7.1
- Upgrade from Exchange
2013 CU20 à
CU22
- Upgrade .NET Framework
to 4.7.2
- Upgrade from Exchange
2013 CU22 à
CU23
https://docs.microsoft.com/en-us/exchange/plan-and-deploy/supportability-matrix?view=exchserver-2019
The problem that most people on old patch levels find, is Microsoft has removed many of the older CU updates which makes moving from an old patch level a difficult task.
Luckily we have a legend that has posted all the Exchange updates here:
Very handy link to keep in your favorites.
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