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Microsoft unbundles Office and Teams globally in new attempt to appease antitrust regulators
(www.geekwire.com)
This is a most excellent place for technology news and articles.
For most these things, it is far cheaper to simply use some sort of SaaS than to actually set things up in house. There's probably plenty of times where it'd in theory be cheaper in the long term, but most businesses are going to see the short term savings as extra capital to try to expand.