store.exe is a process associated with Outlook Exchange from Microsoft. The process allocates RAM memory for Outlook Exchange for optimization purposes. This process does not have a memory leakage but the allocation of memory may cause problems on some servers.
Non-system processes like store.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