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Exchange 2013 CU Updates

Dear Support,

We have exchange 2013 Cu8 currently running.

we have 3 mailbox server and 3 cas servers with same CU8. Now we are planing to upgrade the CU.

question 1= i can directly upgrade exchange 2013 CU from 8 to 2013 CU21 (15.00.1395.004) right? please correct me.

Question 2= i can update first Cas servers and then Mailbox servers respectively right?

Question 3= please share the best practice steps to how i can upgrade CU is there any imapct will be?

 

 

Thanks a lot.