Possible to undo Mark -> 'All Read'?

[Mr_Phyro]

I made the stupid mistake to press Mark 'All Read' in my inbox, causing all my unread emails to be flagged as read. Is it possible to undo this Mark All Unread action?

I'm using Thunderbird 1.5.0.5, and my inbox is an IMAP folder.

[Daifne]

Ctrl+A to select All and then right click and select Mark and select As Read. It's a toggle.

[Mr_Phyro]

This would mark all emails in my inbox as unread, including the ones which which I did read, wouldn't it?

So if I had 300 unread messages out of 1000 messages, my actions caused all 1000 emails to be flagged as read. Doing CTRL+A, Mark -> 'As Read' would cause all 1000 emails to be flagged as unread, instead of just the 300 messages which used to be unread.

I would like to restore the 'unread' state of the 300 emails.

[edit]
Ctrl+U, which is supposed to be undo, shows me the source of the selected email instead.
[/edit]

[Daifne]

Then use Shift+Click on first and last in a continuous group or Ctrl+Click on non-continuous to select the group you want.

Ctrl+Z is undo. This has been true for Windows as long as I can remember.
http://en.wikipedia.org/wiki/Control_key

In the article you are looking at, it is wrong. If you have the shortcuts showing in your Windows menus, you will see what they really are.

[wsmwk]

In current versions of Thunderbird, "undo" will change the messages back to "unread" if you catch it soon enough.

[LIMPET235]

Hello,
Over 2,400 posts & you reply to a thread that died on Fri 8th Sep 2006?

Locking due to very old age.