For those looking for Exchange 2010 SP1 Rollup 3, you’re in for an unpleasant surprise. Today, Microsoft pulled the Rollup because of issues with Blackberry devices sending duplicate messages.

While Microsoft is working with RIM to identify and solve the issue, the advice is to wait for updates regarding this issue and meanwhile put RU3 implementations on hold. If you’ve already implemented RU3 and are seeing no issues, you can leave it installed.

More information regarding this issue on the (revised) EHLO page here.