I have used V4.2.44.2 for years and years. I had no obvious cause to upgrade as I never use anything other than SMTP and POP3. One thing REALLY bugs me with V4 though. The well documented Folder Views and Column Sizing flakyness. I don't believe this was ever really sorted in any V4.* version, was it? Does it work flawlessly in any V5.* version? That alone would make me upgrade. Does backup and restore work any differently (more robustly) in V5.* versions? If I upgrade to a V5.* version and don't like it, can I return to V4.2.44.2 with no issues? Thanks.