I prefer to keep personal appointments on one calendar (on Outlook.com) and work appointments on my work calendar (O365 Exchange), but Exchange only seems to use my work calendar to show my availability to other people in my organization. I'd like to have a way to aggregate my availability from multiple calendar sources, the way that you can overlay multiple calendars in Outlook. It's not really a matter of me seeing all my appointments, because I can easily see everything in a consolidated view in Outlook on my desktop or mobile; it's more about letting others in my organization know when I'm free to meet. I know there is (used to be?) a "free/busy server" option in Outlook client, but I feel like this should be something that can be set on my Exchange profile, so that it doesn't matter what client I'm using.
Aside from that kind of option, I guess I'd guess I might be OK with a solution that duplicates anything added to my personal calendar as a block on my work calendar or vice versa, even if it's an IFTTT-type thing. I saw a similar post that mentions some 3rd-party tools from CodeTwo and Connecting Software, but given this is just a preference of mine, I'm probably not going to spend a lot on a workaround.
TLDR: Is there a better approach to showing consolidated availability than manually duplicating my appointments between calendars? Thanks!
Only the "primary " calendar is used indeed (you can have multiple calendar folders in the same mailbox but few/busy will only reflect the default one). So the only solution is to populate the appointments into the O365 calendar as well. As to how to do it, there are multiple methods. Adding the O365 account as an attendee is an easy solution and hardly takes more than few seconds, and you should even automate it via rules or macros. Similarly, you can get the messages directly into your O365 mailbox by configuring some form of forwarding, or using the Connected accounts functionality. Copy/pasting calendar items is also easy enough to do if you switch to a list view.
Did you ever find a better workaround for this that creating multiple appointments? I have the same issue, and for me it's not only about creating the duplicate, I don't want to see all the duplicates on my calendar view either. I looked into hiding the blocking appointments from my view (basen on subject filter), and that worked, but then I dont know if I manually blocked it (since I do not see it) and could have a mix of singles and duplicates without knowing it. An automated hidden aggregator would be the best option...