You will enjoy all the features of the Groupwise client with the convenience of working off-line. For example, when at the office and connected to the network, you will access your main mailbox using the Groupwise client. These messages will go to a pending folder until such time as you log back into your main Groupwise mailbox. Your remote mailbox and your main mailbox will then synchronize sending all your newly created messages and receiving any new ones. Because you are using the Groupwise client, all passwords and data are encrypted.
POP offers the least amount of features of all the discussed options.
POP by nature is not encrypted, making the possibility of password interception a possibility. Furthermore, all mail is downloaded to the workstation. If you use multiple machines, you will end up with mail scattered about on all of them. To complicate matters, there will be no backup of your mail unless you have taken steps to backup your workstation. Groupwise address books are also inaccessible unless LDAP can be configured in your choice of pop client.