BTW: The layout folder in ACT! 7-9 is under Databases \ [Database Name] files \ Layouts
In ACT! 5/6 they weren't directly connected to a database and all layouts were in the same folder seperate to the databases - defined in Edit Preferences
As to your new question, it depends on your usage, needs and infrastructure.
How many users?
For a single user, you might find 5.0 (I'd prefer 6.0) to be sufficient if the extra functions aren't needed.
What hardware?
If your hardware is reasonably up to date, ACT! 9.0 provides a lot of benefits. I recommend:
Hard drives 7200rpm or faster
1GB on workstations
2GB for server 5-10 users (adjust for different user numbers)
2GB min or dble the RAM (whichever is greater) Swap File
Before you upgrade, check the db with Red Flags to remove corruption that causes issues with conversion -
Regards,
Mike Lazarus
ACT! Evangelist
GL Computing, Aust
For ACT! by Sage and ACT! for Lotus Notes