how to sychronize outlook in multiple pc

im having trouble with my webmail,i’m using outlook for my mail at the office and using web browser to check my mail at home.our webmail provider is network solutions. now my problem is every time i open my mail at home using ie,i cannot see the mails which i already sent from the office and also i want my contacts to be copied in my webmail address book.i exported the address book to .csv file and import it to my webmail but there’s an error occured..is there any one who can help me with this??thankx