Outlook Web Mail (
mail.live.com), you can "check" the checkboxes for a range of messages with two clicks.
In the "normal" way, click the checkbox for a message at the "top" (or "bottom") of the range of messages you want to "check". It doesn't matter if that checkbox was already "checked" or if it was "unchecked"... one click to "set" or "unset" the "checkmark" will do.
If necessary, use the web-page scrollbars to bring the other end of the range of messages that you want to "check" into view.
Hold down the "Shift" key on the keyboard, and click the checkbox on the message at the other end of the range ("bottom" or "top") of messages you want to "check".
All the messages between the first message that you clicked, and the last message that you "shift-clicked" will become "checked". It doesn't matter if any messages between the first and last message was already "checked" or "unchecked", all messages within the range will become "checked". You can adjust the "end" of the range of messages "checked" by keeping the "shift" key held down and clicking the checkbox on different messages to expand or contract the range of "checked" messages.
- If you repeat this proceedure on the same set of messages, the messages will just stay "checked" instead of becoming "unchecked" as you might expect.
- If you attempt to repeat this proceedure on a different set of messages (which might include a subset of the first set, or not), the "First" set (range) of messages will become "unchecked", and then the "New" set (range) of messages will all become "checked".
- Similarly, when "checking" a range of messages in this way, any messages outside of that range of messages that was already "checked" will become "unchecked".
So, you can only "check" one range of messages in this way. You cannot "check" multiple ranges of messages or a range of messages along with individually "checked" messages. You can "check" one range of messages, then individually "check" any other messages that you want "checked".