Thanks both, Shades and Lintalist!
Regarding MailStore, can it pull down email from multiple email addresses / domains, or only one? I am looking for the quickest, one-way, option to do all this.
Given that Archivarius' viewer window always mangles the format of whatever it is displaying, I use it to make an initial search, and then I open the file in its native programs. With emails, I could probably read them just fine in their "mangled" Archivarius format.
Thus, having one way to most simply and efficiently download all the email, let Archivarius index it, and then search it in Archivarius is what I'm going for. Introducing yet another program to my arsenal would be less than desirable, but potentially worth it--especially if I could use it for other email domains I have outside of Yandex.
Thanks for your input.