Re: Freeoffice et al
exchange 2019 doesnt support outlook 2010 but 2016 does. We are now actively looking at transitioning from MS office to libreoffice and using OWA for email with our exchange server. Afterall, if you use office 365 then it is browser based anyway so why not just use OWA? Apart from additional CALs it will be significantly cheaper for us in the longer run.
Biting the hand that feeds IT
