Windows client
Install on the PC that already talks to Exchange. The trial is the same product as the paid client. Create a free account with the mailbox email and the 30 days start; buy seats before day 31 if you want to keep running it.
Looking up the current build…
Download Introspect for Windows Create the free account Create the free accountA zip file, signed. Unzip it anywhere and double-click Install.cmd. No administrator rights are needed; Introspect installs for the current user and updates itself from then on.