Mail alert

Hello,

Could you please help me in creating a mail alert ( something like remainder) in MS office outlook?
I have 5 group mail boxes configured in MS office outlook, in which
--> from one of the group mail box i want to get mail alert if any particular mail comes in that inbox with some specific subject.
--> In another mailbox i need to get a mail alert for whatever mail appears.
Since My Outlook is configured with 5 mailboxes, i ll get mail popup only for first mailbox which i configured, because of this sometimes i may not know if any urget mail received in other mailboxes.
Hence could you please advice if there any solution for this and your help would be much appreciated.
I have another query too,
since it is a group mailbox, will this change will be implemented in my collegues mailboxes too or in only in my system?

Please advice.

Thanks in advance.

Priya