About a year and a half ago Motorola sued Apple in German courts and won an injunction against Apple's push e-mail technology. Push e-mail technology allowed Apple to push from mail servers to a user's iPhone or iPad making the e-mail appear almost instantly. Back in 2012, a German court found that the technology behind Apple's push e-mail system infringed on a patent held by Motorola.
The court granted an injunction and Motorola chose to use that injunction to block Apple from using push e-mail for its customers. Apple appealed the decision, but the next court upheld the original decision. Apple has now reportedly put up a $135 million bond and has been cleared to begin using push e-mail services again.
During the outage for push e-mail service that last year and a half, iPhone and iPad users in Germany were left only being able to access e-mail using pull services that requested e-mail from the server on schedule. Apple isn't out of the woods yet and may ultimately end up having to license the technology from Motorola.