It's just business. Microsoft are just adjusting for currency fluctuations. Nothing to do with their pricing structure.
All companies do it. After Brexit supermarket prices in the UK have steadily risen too. http://www.independent.co.uk/news/b...lar-euro-currency-exchange-rate-a7358926.html
Another Brexit driven example is Sonos: http://news.sky.com/story/brexit-pound-plunge-pumps-up-sonos-speaker-prices-10766907
On the flip side when currencies get stronger you may get a price drop. Like Australians did in 2011 for App Store pricing. http://www.lifehacker.com.au/2011/07/finally-apple-australian-app-store-pricing-matches-the-us/
Would love to see some sources on this UK predicted "boom". It's been grim news after grim news so far. And I've seen nothing to suggest otherwise recently.
And the pound has "gone up"? Where are you getting your rates? The pound is significantly weaker post Brexit: http://www.xe.com/currencycharts/?from=GBP&to=USD&view=1Y
It's been on the national news, I'll have a look later if I get the chance.