1 files changed, 3 insertions, 0 deletions
diff --git a/UPGRADING b/UPGRADING
index 88e9c53f8..7df82b00a 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -48,3 +48,6 @@ Post-Upgrade Activities
 -----------------------
 1. Check .htaccess settings (some php settings could become required)
 2. If you're using build-in addressbook, run indexing script /bin/indexcontacts.sh.
+3. When upgrading from version older than 0.6-beta you should make sure
+   your folder settings contain namespace prefix. For example Courier users
+   should add INBOX. prefix to folder names in main configuration file.