[horde] Upgrade or Clean Install...

[Horde]

Hello

Currently running with quite an old version of Horde (3.1.3) plus bits  
(imp/turba/kronolith/ingo/mnemo/nag) and looking at moving to  
Groupware Webmail Edition. But uncertain if it's possible to migrate  
the data from my current installation to the groupware edition. Key  
item really is the calendars, although I guess they could be  
exported/re-imported.

Any assistance/guidance appreciated.

TIA and regards
Kevin