“According to French press reports, by switching from a proprietary tool to Zimbra, the city avoids having to pay EUR 700,000 for renewal of proprietary licence fees. The city has earmarked EUR 200,000 to cover the exit costs and to tailor Zimbra to the needs of the administration.”
See City of Rennes to tackle IT vendor lock-inI wasn’t at first avoiding vendor lock-in when I first began to use GNU/Linux in schools (I just wanted software that worked.) but I’ve seen this e-mail problem in schools. Some company has ownership of your data and if you want to continue using their product you pay through the nose for the right to keep access to your data… It’s a racket. The same thing extended to the desktop OS with fake new file-formats designed simply to keep users on the Desktop OS treadmill. Enough of that.
Use FLOSS (Free/Libre Open Source Software). It’s software that works for people not slave-masters disguised as businesses providing a service. The world can and does make its own software. There’s no need for monopoly. Use GNU/Linux and FLOSS applications.