Dear Exchange Expert,
We are planning to migrate to Office 365 and we plan to run hybrid.
Currently we have on premise exchange servers and other countries also connected to us via the VPN Tunnel. Our exchange server architecture is as below:
HQ:
2 AD Server
2 Transport Server
2 Mailbox Server
2 Spare Mailbox Server
HK and Japan
2 AD Server
2 Transport Server
2 Mailbox Server
All of the Exchange Servers are Virtual Server as we are using Hyper V in our environment. We have DAG being configured across countries, so when one country email server down, they can failover to other country.
My question is: how am I perform upgrade to SP3? what will be the correct steps? because when I upgrade one for instance a transport server on HQ and when it is successfully upgraded, will it cause issue to communicate with other exchange servers since others might not yet upgraded?
are the upgrading risky? any downtime for this?
Thanks.
Regards,