Side question, off topic: I am seriously considering switching to Linux (Windows slow, auto-updates outside my control). I'd start with a dual boot and see whether i will miss some apps.

My sticking issue is mailbox. I like local email storage bc of responsiveness, offline use, as opposed to web ui. Is there an email/calendar client that can work on windows and linux, and update the same file? E.g if i sent an email on Windows, and now i am on Linux, i'd like to see it in my sent folder. Any tips?