I do appreciate the feedback, but the solution you recommend doesn't work with my servers or meet my needs so I am looking for alternatives.
At this time I haven't found any other way to get combined views of my inbox and calendar. I will take the time to further investigate the issues you linked to so I can make an informed decision.
Just an FYI, I am pretty sure you are acting as a "test bunny" for K-9 Mail as well. Have you taken the time to review the Issues or Release Notes lists?
K-9 Open Issues -> Issues - k9mail - Project Hosting on Google Code
K-9 Release Notes -> ReleaseNotes - k9mail - Changes in each revision of K-9 - Project Hosting on Google Code
I'm sure if you looked at Touchdown, Maildroid or any other piece of software that is developed by humans for humans you would find the same sort of thing. At my day job (don't need a gig at a lab) the project I lead also has a backlog of issues.
That is the difficult thing about software development. It is relatively easy to write software that works with the primary use cases, but when you deviate into alternate flows, strange and difficult to reproduce bugs often occur. That is even more true in the case of mobile development as there are many variables (connectivity, server versions, user error, OS and API differences) that can contribute to those alternate flows.
Please don't take any of this as a slam against you or K-9 Mail. From what I've read, K-9 seems like a very well run project and is meeting lots of people's needs. I just wanted to present a counter point.
As for me, I've tried K-9 and Maildroid (my Exchange Server only supports EAS) as well as purchased and used Touchdown for 8+ months (works great with Exchange but doesn't support the combined views I am looking for).
I also have 8+ months of my wife using the stock Email client on her Eris via IMAP and SMTP without a single issue.
Since I mostly triage mail on my phone (read, flag, delete) and rarely send anything I am going to continue to try the solution while I check on the status of the bugs.