For end users, the problem with Exchange seems deceptively small. According to Apple's posting, "When you respond to an exception to a recurring calendar event [meaning "to a change to a single instance of a repeating calendar event"] with a Microsoft Exchange account on a device running iOS 6.1, the device may begin to generate excessive communication with Microsoft Exchange Server. You may notice increased network activity or reduced battery life on the iOS device. This extra network activity will be shown in the logs on Exchange Server and it may lead to the server blocking the iOS device."
"This can occur with iOS 6.1 and Microsoft Exchange 2010 SP1 or later, or Microsoft Exchange Online (Office365)," according to Apple.
Apple released iOS 6.1.1 version this week but that has a specific target: It "fixes an issue that could impact cellular performance and reliability for iPhone 4S."
For over two weeks, some users have reported that once updated, their iDevices now quickly drain the battery. Other users complained that their iDevices wouldn't connect over Wi-Fi or, if they did, quickly and repeatedly disconnected. Yet despite the litany of online complaints, it's difficult to tell how widespread these problems are among the total number of 6.1 updaters.
On the enterprise side, the heavy transaction logging on Exchange surfaced quickly for some companies.
"It may be a fluke, but something to watch for...," wrote Bobby Pendino, senior Microsoft Exchange administrator with Zachry Holdings, posting Jan. 31 at Microsoft Technet. One Zachry Apple user upgraded to 6.1 and "immediately after he finished, his phone/iPad started causing excessive logging on the Exchange server....His device caused over 50GB worth of logs for that particular database."
In a later post, Pendino added: "Had another one upgrade their phone and now their phone won't authenticate. Another iPad was updated, and it says it's connected but doesn't retrieve any data. Thanks Apple!"