I’ve been using this product for a while. One issue I had was that because of an odd situation I am unable to use IMAP email on my own personal domains email, so on 2 different computers the email is different. It’s difficult to sync email using POP as it actually downloads the email.
I had been using Mailstore Home portable on a USB stick and carrying it back and forth between the 2. It works but is clumsy.
I had an idea to put the Mailstore Home app and DB on my Google drive. I tried it and it works well. I can archive the email, let it sync on Google drive and then read / search it on my other PC.
Some caveats. You cannot use the app on both computers at once, it may work for just searching but just by opening the app I think it alters the data somehow, and doing it on 2 different PCs it’s going to get messed up. I only use one computer at a time and have the other shut down.
You need to make sure and give Google drive enough time to sync the data before shutting the computer down, failing to do this will screw your DB up pretty badly.