What's more, predictive analysis from Crittercism, another mobile intelligence provider, indicated that the rate of adoption will remain lower than even that of iOS 8 - the launch of which was plagued by technical problems - through at least the first week of availability. Once users are more secure in the knowledge that iOS 8's problems won't be repeated, however, the upgrade rate should go up sharply.
That doesn't leave much time for IT departments to prepare - Crittercism's estimate is that iOS 9 will hit 50% adoption within 25 days of release.
Source: Network World
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