Low memory condition

"veritypicken-/[email protected] [eccopro]" <[email protected]>
Newsgroups gmane.comp.windows.eccopro
Message-ID <[email protected]> 
When I try to enter a new appointment in the Calendar, a box appears saying 'Unable to complete command, low memory condition detected'.  I am, however, able to enter a new To Do or a new name in the Phonebook.
 

 I run Ecco 4.01 (32 bit) and have Windows Vista.  I have been using Ecco in a low-key way since 1996 (mostly Calendar, Phonebook and ToDos.  I use the Calendar as a diary as well as for appointments so there is quite a bit of data there.  
 

 I see on Google that others suggest renaming .alm and .cfx files but I cannot find these.
 

 Please advise.
 

 Kind regards
 Verity
 

 
 I intend upgrading to Windows 7 or 8.1 soon - which is easiest for Ecco?
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