Sorry, I am not using Exchange 2007, but I can say that, on Exchange 2011 (via Rackspace) 10.9.2 eliminated the primary problem of large attachments (in my case, almost any attachment) causing Mail to "lose" the server. Prior to this update and like others with this problem, I had to right click my Inbox and take the account offline and then take it back online and the messages with attachments would suddenly go. Now, with 10.9.2, messages with attachments appear to go immediately, and for two days now I have yet to have an instance of Mail losing the server (whereas, pre-update it was an hourly occurrence). So, it appears to have solved at least this one common problem; I can't speak to the other problems on the list.
Regarding MS Office, it may be dreadful, but Apple has failed to make iWork even reasonably capable of importing and exporting from/to MS Office, which 99% of the working world is using, so until they do, most of us are stuck with it. Like many, I operate in an environment where I must share and collaborate on documents, spreadsheets and presentations with iterations going back and forth. This cannot be done without all manner of formatting problems from mishandled fonts to misaligned graphics. If I could make everyone else in the loop switch to iWork, that would fix the problem, but that will never happen. Either Apple needs to man up and make the transition literally foolproof or forever be the irrelevant also-ran in this area. And, speaking of a lack of updated software, Csound1, when's the last time Apple updated iWork?