Well the State of Schleswig Holstein is ditching Microsoft completely. But it's a difficult political uphill battle, because some Users won't change their habits and cry about it.

The Minister shut this up with "Software is a decision by the employer, the employee has to accept it"

Which then got blown up by the tabloid media, which ran BS Headlines like "OMG Courts and Police not working (because they're childish and refuse to learn another E-Mail Client)

Also Microsoft is playing dirty and lobbying very hard behind the scenes to obstruct it, in Munich they changed their German HQs to Munich and started to pay Taxes there. So suddenly the city changed back to MS

TL;Dr: It's a thankless and tough battle for politicians, because they face lobbying and media pressure against them. Also they will be blamed for any roadblocks, and there is no real upside for them in it, as no one except for a few nerds cares about this