Search of information through multiple accounts

It would be nice, if the X-notifier would allow search of information through multiple accounts, and opened those account(s) which contain the required information. Sometimes, users forget via which account was sent or received some specific email, and it takes  a lot of time to run Google search for each account separately in order to find the required information.

Is it difficult to implement such a feature? Or, there is some kind of solution for this issue already?