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.
