So emails filtered into folder B need to have a means of selecting older emails and moving them to another folder. Options depending upon where you want the older folder B emails to go: '''If you want to delete them off computer and any copies kept on server:''' Set up a Folder B Retention Policy. * Right click on folder B and select 'Properties' * click on 'Retention Policy' tab * uncheck 'Use my account Settings' * choose an option eg: * Select: 'Delete messages more than eg: 30 days old'. * click on 'OK' ------------------------- '''If you want to Archive the emails - these emails will be still be available via Thunderbird under the 'Archives' folder.''' Set up Archive options: 'Tools' > 'Account Settings' > 'Copies & folders' for the pop mail account or right click on mail account name in Folder Pane and select: 'Settings' then select 'Copies & folders' for the pop mail account. under 'Message Archives' section * select: 'Keep message archives in' * Select: 'Archives folder on' mail account name * click on 'Archive Options' button Depending upon how many emails you get select one of the following: * If a lot of emails select; 'monthly archived folders' * If a reasonable amount but not loads, then select: 'Yearly archived folders' If you want to keep the existing folder structure: * select: 'Keep exisiting folder structure of archived messages' Example, if you archive 'Sent' messages, you may want to have them separated in the Archive folder, showing in a 'Sent' folder. Archiving is very useful for moving all older mail from any folder so that you have more space in the original folder. * click on 'OK * click on 'OK' to close and save Account Settings. '''How to Archive:''' * click on Folder B * Sort by Date and unthreaded * Highlight a selection of older mail - click on first one, hold down 'shift' and click on last one - this will highlight all emails in between and display them as 'conversations' in the lower Message Pane. * Click on the 'Archive' button. Note: if you select any email or batch of emails and press 'A' - it will Archive those emails. 'A' key is the keyboard shortcut for archiving selected messages. ----------------------- '''Manually run a filter on Folder B'''. Tools > Message filters * click on 'New' * give filter a suitable name * Apply filter when - only select: 'Manually run' * select 'Match all the following' Use conditions/rules eg: * 'Age in Days' and 'Is greater than' and select a number eg; 30 Perform this action * 'Move message to' and select the folder on the mail account or Local Folders. * click on OK * then enable that filter and disable other filters * select: 'Run selected filters on 'Folder B' in mail account. * click on 'Run now' to run that filter on only Folder B. ------------------------- I've offered a few options for you to consider. Personally, I would use the 'Archives' option, but it depends upon what you are trying to achieve.

Dear Toad-Hall, thank you very much for your support. It's exactly what I'm looking for