Blackberry / mobile support

Nothing OOB as far as I am aware.  If you need to build something yourself, a general approach would be to build a service that periodically checks the inbox of a particular account (i.e. k2workflow@yourcompany.com).  Have all of your email notifications be sent from the workflow with that 'From' address.  Put the process serial number (i.e. ProcessInstanceID_ActivityInstanceDestinationID) at the bottom of the email.  When the service reads the email, parse it for their action and the serial number, then get the sender's AD name (query AD based on email address if needed), impersonate a connection to K2, and action the work list item.  Needless to say, you'll need some really good exception handling in that service since users will be sending actions via email and the odds of typos is high for mobile devices.  You might want to consider putting something like the following in the email body:

Place an X in one of the following choices:

[ ] Approved
[ ] Declined

The problem with this is that the user has to scroll down into the original email body when replying (old Blackberry devices locked the original email body; not sure if they still do).  So, you might have to have a convention for the business to use.  For example, the email might say 'Responde with an 'A' to approve or a 'D' to decline.  Then the user just hits 'Reply', types in 'A' or 'D' and hits send.  Again, not perfect by any means, but it can certainly be done.  If your users are on authenticated on the network and you can get their AD credentials, it might be easier to build a mobile form instead of the email approach.

adding to this thread:

http://www.k2.com/en/K2mobile.aspx