Hello,
I've just started at a company who have a single Exchange 2013 server. it's not huge (about 80 users) but it is on CU9 so more than a few updates behind. Ultimately the company wants to migrate to Office 365, having already a subscription for Office apps and onedrive.
Typically I'd upgrade the server to the latest CU before starting anything but here is the problem and the reason food the question. The company has recently become a 24/7 operation and has declared that as such they can't afford for email to be unavailable
for the length of time it takes to run the CU updates (there are also a lot of Windows updates to apply). What I am thinking here is that we need to add a second exchange to the domain, make it highly avaliabe from a cas perspective (even if we don't
create a dag) then migrate the mailboxes away from the first server so it can be updated without any downtime. I can no longer get CU9 so would be looking at the latest CU version for the new server. Does anyone see any potential issues with my plan? Naturally
load balancing will be employed for external and MX etc
Are their any other options? Would either a cut over migration or migration software like code two help here?
All advice welcome
Thanks