As enterprises rely ever more deeply on mobile devices for email, CIOs beware. A bug in iOS is periodically hiding email messages, in a way that makes the messages appear to have been deleted.

Here’s how the bug makes its presence known. (And, yes, it’s an intermittent bug, which is tech support’s favorite phrase.) Let’s say you just downloaded 50 email messages. As you scan your mobile inbox, you notice four messages that you need to respond to right away. The others are junk that you want to delete now so that you can focus on the critical ones.

You then choose “Edit” and select everything other than the four important messages. You select “Trash” and, poof! Everything disappears. But wait, I specifically did not those four crucial messages. What happened?

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