If this is your first time using Add2Exchange or you are upgrading or migrating, post here.
When upgrading to Enterprise, you do not have to re-create the relationships in order for them to work correctly. Enterprise can use single relationships created by Standard. Although, to use it with the "new way" of syncing homogenous or the same types of relationships using the RGM of Enterprise, using AD Distribution Groups and Templates, you would have to delete the singles and re-create them.
Again, it is not necessary to convert them but you can after the upgrade if you wish to do so.
Additionally, if you have been exporting the GAL manually (or by some other process) and want to use the automatic GAL relationship function, you would remove the relationship(s) to your manually exported GAL folder, and either use a new folder or empty that folder to use the GAL function, and then make a GAL Template function to replace the manual export.
Again, this does not have to be done immediately upon upgrading, but can be planned as Enterprise Edition will use the same kind of single relationships Standard made without issue.
In Standard edition, you can fill the GALCache with any contacts you want, including those from AD, but it is a manual process. Enterprise edition will automatically extract the contents of the GAL, minus the ones you have excluded, and create the folder and contacts contents automatically, and you can make Template GAL relationships to go to the individual users. You can also put small pictures attached to the GALCache contacts, and when the user calls from their numbers listed or send emails, those pictures will show up both in Outlook and on the phone.
Questions to ask: