The problem is that Pegasus Mail updates configuration files each time it is opened and closed.  Those configuration files reside inside of the mailbox directory.  Because of this, the mailbox directory can not be accessed by two instances of Pegasus Mail at the same time.  This is key:  two instance of Pegasus Mail can not access the same mailbox at the same time.  The result often is corruption of one or more files in the mailbox directory.

If the mailboxes are on one machine then the devices must always have access to this machine in order to do email.  There is a concept of New mail mailbox and Home mailbox  whereby new mail is stored locally until moved to a folder at which time it is moved to the home mailbox.  This might work for you but requires that users keep their new mail folder empty in order for all mail to be accessible by other devices.  The limitation of two instances simultaneously accessing a mailbox remains. 

Finally, Pegasus Mail is multi-user capability meaning that a single installation can be run by multiple users.  In my office I have a single instance of Pegasus Mail installed on a server with 13 users running that instance on their desktop PCs.  Each user can run their configuration from whatever office PC they need to but the caveat remains that they can run only one instance at a time.  The problem with this setup is that laptops, tablets, and smartphones need access to the mail when not connected to the office LAN (that's where running an IMAP capable mail server comes in).  If all of your family devices will only access mail when connected to the home LAN then the multi-user approach would work except for devices that can not run an app like Pegasus Mail (eg;  smartphones and iDevices).

Hi all, I am new here and was told that Pegasus might be what I am looking for. I was hoping to set up a mail "system" at home. There are 3 of us with multiple email accounts and computers. I have 2 laptops, wife has a laptop and a tablet and my son has 2 laptops. There is also a desktop that I use for mail at the moment. I would like to be able to access my email from any of these devices. Can I use Pegasus to do this? Having the storage folder on the desktop and accessing it from each of the laptops.

The short answer is no, at least not the way you envision it.   The problem is the access to the same mailbox by multiple devices.  In order to accomplish this with mail stored locally you would need to be running your own mail server (Mercury Mail Transport System for example).  This seems overkill for a family but is certainly an option. 

IMHO, the solution is to configure all devices to access mail via IMAP.  With IMAP, mail stays on the host server until deleted.  This keeps it available to any device.  This differs from the POP3 protocol that you are familiar with which downloads mail.  IMAP allows for copies of messages to be stored locally if needed.

As for Pegasus Mail, it is an extremely powerful and flexible email client.  It can handle multiple hosted mailboxes in a variety of different ways, all in one or each as its own identity, either via POP3 or IMAP.  It has an excellent support community.  I would be remiss not to state that the current Pegasus Mail is old technology so has some limitations.  I find the capabilities far outweigh the limitations and know that the limitations of the old technology are being worked on for a future release.

To learn about the capabilities of Pegasus Mail consider downloading it and reviewing the included manual.  You can extract the manual my changing the extension of the downloaded .exe to .zip and then extracting the manual.pdf file.

Thanks for you reply. Unfortunately with the lazy buggers in this house mail would never be deleted from the server. I did have something like this working a few years ago using Outlook express. It worked well but it is no longer available with Win7,8 or 10. 

If I was to store the mail on the desktop and open it on one of the lap tops what would have if it was tried to be opened on another? In other words have 2 or more laptops with the same mailbox?

PS. In the process of reading the manual.