The Outlook client is not the issue. Once purchased you can continue to use it for 10 years if you like with no further licensing or other costs. It's the Exchange server itself that legally requires the CALS for every new version of Exchange.
eh. upgrading your outlook brings costs, as afaik the outlook is not anymore bundled with exchange.
so, the logic is the same. now the actual question you should be asking, why would you keep upgrading to the latest and greatest every time they release one?
you can keep using the version you bought for ten years. this 100k/5y is self inflicted cost and I think you should be asking why YOU are making it.
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KiXnet
