When I start my upgrade from V0.1.1 to V2 will my existing email accounts, contacts & sent messages be maintained in the new version, I have saved the web directory and run an SQL backup of the existing database.

As long as you only alter the table stucture in the database, not delete anything then i dont see why you would loose any information. Sent messages are stored on your IMAP server. You said you have a backup any way so you can always restore the DB if you need to.

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RoundCube Patches & Plugins: Managesieve, SpamAssassin Prefs, and more…

Thanks for that, I assumed the upgrade would retain most of the data, I will be taking to option to upgrade via the browser after replacing the files in the web directory as per the UPGRADING document.

I have followed the upgrade document ending up by running the sql from the mysql.update.sql file. now when I try to open RC I get this error:-
QUOTE:
Warning: require_once(include/rcube_imap.inc) [function.require-once]: failed to open stream: No such file or directory in /home/my-domain/public_html/webmail/index.php on line 82

Fatal error: require_once() [function.require]: Failed opening required 'include/rcube_imap.inc' (include_path='/home/my-domain/public_html/webmail/:/home/my-domain/public_html/webmail/program:/home/my-domain/public_html/webmail/program/lib:.:/usr/lib/php:/usr/local/lib/php:/home/my-domain/php') in /home/my-domain/public_html/webmail/index.php on line 82
END-QUOTE:
rcube_imap.inc does not exist in the include sub directory. have I got an incomplete download? or have I missed something?
Can anyone assist Please.

Discovered that the index.php had not updated after the upgrade and the first error, so now that I have upgraded index.php I get a blank IE6 screen and on Firefox I get
QUOTE:
Content Encoding Error

The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.

* Please contact the website owners to inform them of this problem.

END-QUOTE

Do you think I should rename my existing database and go for a new clean install instead?

Can anybody assist with this problem Please?

are you using firefox? a quick search found this The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.. could be worth a try. if you are using ff does the message also occur in other browsers?

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RoundCube Patches & Plugins: Managesieve, SpamAssassin Prefs, and more…

As mentioned above, IE6 gave me a blank screen, FF gave me the error.
But, the problem has been cured by my hosting support man.
The server PHP required a change,
Quote from him:
"The changes were made in the main php configuration file on the server after examining the contents of the script error log."
End-Quote:
exactly what changes were made to cure my problem are unknwon. All I know is there was nothing wrong with my install and it now works in whichever browser I use.

i got the same error.