SCCM 2012 R2 CU4, how can we make sure clients without any CU upgrade will continue to communicate?

Hi,
We're about to upgrade the SCCM 2012 R2 server from CU1 to CU4. However no clients were ever upgraded (don't even have CU1). Is there any way(matrix or other) we can assure ourselves clients will keep on communicating (f.e. for SCCM R2 CU4, clients need at
least to be at CU1)?
Please advise.
J.
Jan Hoedt

Go through each one and see for yourself. Note that they are cumulative so you only need to deploy the latest. CU4 contains all the others. The issues that are fixed are listed.
CU4
https://support.microsoft.com/en-us/kb/3026739?wa=wsignin1.0
CU3
https://support.microsoft.com/en-us/kb/2994331
CU2
https://support.microsoft.com/en-us/kb/2970177
CU1
https://support.microsoft.com/en-us/kb/2938441
It's always better to use the latest version where possible.
Gerry Hampson | Blog:
www.gerryhampsoncm.blogspot.ie | LinkedIn:
Gerry Hampson | Twitter:
@gerryhampson

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