notify.exe is tray bar process that belongs to the Novell GroupWise application. It alerts the user of any received e-mails and messages. This is a non-essential process.
Disabling or enabling it is down to user preference.
notify.exe is also a process which is registered as a backdoor vulnerability which can be used by a malicious attacker to gain full access to your system. This process is a security risk and should be removed from your system.
Non-system processes like notify.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues