All users of the Office 365 paid subscription have just received a letter notifying users that the monthly fee has risen from 199 to 229 rubles:

New prices will take effect in two weeks, from February 25th.
The reasons for the increase in prices are not explained, but it is not necessary to guess for a long time. Thank you for not being on Skype, in which prices have risen in proportion to the euro - at times.