I don't think it's i9000 policy. I'michael at minimum one build behind you ón my mác (i don'capital t check for up-dates really often:)) and will update to observe if i cán repro. I know some of the insider increases have become a bit buggy, so it could be a temp issue. I believe I might find the bug on my outlook - do not possess the on my pc folders visible but when i looked in preferences, the option to conceal was not chosen. They showed up when i closed the discussion. I normally maintain them hidden as i make use of imap and exchange accounts and don't have anything in the regional folders.
I don't call to mind transforming the Hide choice. How to verify server certificate for gmail on mac mail. I'll test to repro with the new build.
The files are located in the hidden Library folder. To view the location, you must first unhide the Library folder. Here are instructions for unhiding the library in Yosemite. PST is the native and proprietary file of Outlook and by putting your Mac Mail data into PST, you can migrate your data. But the only problem is that there’s no official or default way to do it. Apple Mail only allows archiving contents into MBOX.