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Back in the day, Microsoft seemingly kept a long list of enemies otherwise known as competitors, as the company’s product portfolio grew in ambition. However, the days of vindictive and arguably petty Microsoft seem to be behind the company as it’s enemies list shrinks and its collaboration roster expands, yet, there are still a few areas in where the company keeps a healthy competitive nature and to that end, some software, services, and companies remain on a figurative and literal blacklist. According to a report from GeekWire, not only does Microsoft have a figurative blacklist, there is a literal blacklist of products that have been obtained and services from the following companies are frowned upon in internal use by the Redmond-based software company including obvious names such as Amazon Web Services and Kaspersky as well as a few head-scratchers in Grammarly and GitHub. Perhaps, the most noteworthy exclusions come from recent IPO darling Slack, to which Microsoft offers a competitor product in its Teams communication service. Unlike its more neutral stance on cross-platform usage and development, Microsoft seems to be taking an active roll in discouraging and even prohibiting the use of Slack by company employees.  We have some of this prohibited software posted on OUR FORUM.